Editar flash exemunkák

Szűrő

Legutóbbi kereséseim
Szűrés erre:
Költségvetés
eddig:
eddig:
eddig:
Típus
Készségek
Nyelvek
    Munka státusza
    2,000 editar flash exe munka, árazás ebben: EUR

    Szeretnénk a Holland Global Multi Cégünknek egy digitális életteret biztosítani. Ehhez egy weboldalra lenne szükségünk ami egyben tartalmazza a webshop-ot is. - PHP, Flash.  - Rugalmasság.  - Hatékony és gyors kivitelezés.  - Naprakészség

    €135 (Avg Bid)
    €135 licitátlag
    3 árajánlat
    Tervezzen weboldalt Véget ért left

    Weblap készítés tervezés, flash animációk készítése, képek szerkesztése, képmanipulálás photoshoppal,

    €908 (Avg Bid)
    €908 licitátlag
    2 árajánlat

    személyes video Az adatbázis megvan, 3D. vagy flash kellene. Példák a feladatra:

    €1958 (Avg Bid)
    €1958 licitátlag
    5 árajánlat
    App móvil y web AulaPadel 6 nap left
    HITELESÍTETT

    ...geolocalización y Google Cloud que permita crear soluciones móviles sólidas, escalables y confiables que satisfacen las necesidades de los usuarios corporativos y personales. Desarrollo Crearé un panel de administración del sitio web para que puedas realizar un seguimiento de todo desde él proyecto. Ejemplo: Administrar usuarios (Listar / Agregar / Editar / Eliminar usuarios) Administrar categoría (Listado / Agregar / Editar / Eliminar categoría) Tipo de aplicación: Híbrido Lenguaje de programación: Dart Marcos: Flutter Herramientas: Android Studio • firebase Propósito: Entrega • Restaurante • Compras...

    €254 (Avg Bid)
    €254 licitátlag
    14 árajánlat

    ...nascimento) e o cliente B tem um crachá com 6 dados variáveis (nome, identificação interna, CPF, RG, data de entrada e carteira profissional). No segundo ambiente somente o cliente terá acesso para que ele faça os pedidos e anexe fotos de forma unitária (cada crachá será pedido unicamente por ter dados variáveis, mas poderá fazer parte de um pedido com 5 crachás, por exemplo). As contas de admin poderá editar e excluir pedidos afim de corrigir erros dos clientes (envio em duplicidade, erro de escrita, etc) Deverá existir um controle onde o admin adicione unidades e a cada vez que o cliente solicite um crachá esta unidade seja abatida do seu saldo. Tanto cliente quanto admin de...

    €122 (Avg Bid)
    €122 licitátlag
    12 árajánlat

    Es una edición de video que hice para un cliente de México para su canal de YouTube, en este proyecto me encargue de editar y subtitular los videos (poner transiciones, filtros y los subtitulos)

    €18 / hr (Avg Bid)
    €18 / hr licitátlag
    21 árajánlat

    Necesito un editor que pueda imitar o mejorar la calidad de mis videos actuales, seran videos de 10-13 minutos. REQUISITO PRINCIPAL: Editar con DAVINCI RESOLVE Si quiere destacarse sobre los demas, envie su portafolio en la propuesta!

    €38 (Avg Bid)
    €38 licitátlag
    26 árajánlat

    ...Unity Unreal Exe. - Export the video as an mp4. - Complete the job ASAP. - Include these: 1 PLM 2 AI report 3 AI Foreman 4 QA 5 Safety 6 Collaboration with each in less than 10 seconds, you should add these 6 features to the video sequence, by creating a foreman, producing an ai report via chatgpt etc. So the total time would be less than 1 minute 30 seconds. Ideal skills and experience: - Proficiency in Unity Unreal Exe. - Familiarity with Windows mp4 format. - Attention to detail and excellent time management skills. The deadline is a high priority for this project, so please only apply if you're confident you can deliver on time. The attached files plus an exe file would be all that would be provided. You can create a storyboard by feeding the existin...

    €112 (Avg Bid)
    €112 licitátlag
    34 árajánlat

    Estoy buscando un editor profesional de reels para editar y llevar mi marca personal, la grabacion y edicion son a 2 camaras, necesito una persona responsable y disciplinada que se involucre en el proyecto y que hable Español con ganas de trabajar a largo plazo importantísimo, y que no me agá perder tiempo.

    €10 / hr (Avg Bid)
    €10 / hr licitátlag
    32 árajánlat

    For this project, I'm seeking a skilled professional who is proficient at integrating composite animation videos. You'll need to be able to: - Generate an animation video with a file ported using Unity Unreal Exe. - Export the video as an mp4. - Complete the job ASAP. - Include these: 1 PLM 2 AI report 3 AI Foreman 4 QA 5 Safety 6 Collaboration with each in less than 10 seconds, you should add these 6 features to the video sequence, by creating create a foreman, producing an ai report via chatgpt etc Ideal skills and experience: - Proficiency in Unity Unreal Exe. - Familiarity with Windows mp4 format. - Attention to detail and excellent time management skills. The deadline is a high priority for this project, so please only apply if you're confident you c...

    €110 (Avg Bid)
    €110 licitátlag
    38 árajánlat
    editar mi editor de busqueda 5 nap left
    HITELESÍTETT

    necesito editar mi buscador mi web es - deseo que sea tal cual es en esta pagina Buscador que deseo: que se pueda escoger multiples direcciones, que este tal cual la pagina de referencia Pagina hecha en wordpress plugin y theme usado: Houzez

    €30 (Avg Bid)
    €30 licitátlag
    20 árajánlat

    Estoy buscando un editor de reels para mi marca personal la grabacion y edicion son a 2 camaras, necesito una persona responsable y disciplinada que se encarge de editar no estoy para perder el tiempo, y que hable Español con ganas de trabajar a largo plazo importante.

    €13 / hr (Avg Bid)
    €13 / hr licitátlag
    51 árajánlat

    I'm in need of a developer who can compile a Windows Exe file for the Real-ESRGAN GitHub project. The Exe file should operate on CPU, and accept command-line. Currently, the GitHub project offers only a GPU exe file, hence the need for a CPU version. GitHub link for Real-ESRGAN:

    €38 (Avg Bid)
    €38 licitátlag
    5 árajánlat
    Editor de foto 4 nap left
    HITELESÍTETT

    Hola busco editar dos fotos en photoshop

    €19 (Avg Bid)
    €19 licitátlag
    86 árajánlat

    Necesito para mañana editar 9 vídeos cortos, con duraciones entre 3 y 10 minutos, que el resultado final no será más de 1 minuto en ningún caso (la edición es muy sencilla ya que no hay muchos cortes). Necesito exportar cada vídeo en 1:1, 9:16 y 16:9. Además, necesito añadirle subtítulos a la vez que voy hablando

    €166 (Avg Bid)
    Sürgős
    €166 licitátlag
    29 árajánlat

    Necesitamos un programador especializado en desarrollos con Squarespace. Capacidad para poder editar css y javascript de una plantilla. capacidad para que los cambios se vean en los navegadores y moviles más utilizados

    €157 (Avg Bid)
    €157 licitátlag
    32 árajánlat

    ...por ejemplo actividad de citas, mejores servicios, mejor miembro del equipo, proximas citas... boton 2: calendario (PARTE MÁS IMPORTANTE DE LA WEB/APP)ya que será dónde los clientes agendarán todas sus citas. Esta parte ha de esta conectada con la configuración del mensaje ya que si agendan una cita, el cliente Xh antes ha de recibir el mensaje por WhatApp. Boton3: editar plantilla del mensaje: en este botón se podrá editar la plantilla previamente rellenada para configurar el mensaje boton 4: autoagenda: esta parte servirá para crear un link y que los clientes se puedan autoagendar segun la disponiblidad (se ha de poder definir los servicios que ofrece y su precio) boton5: contactos: registro de contactos boto...

    €1454 (Avg Bid)
    €1454 licitátlag
    61 árajánlat

    Busco desarollador web experto en Shopify que pueda editar themes, con conocimiento avanzado de liquid y otros lenguajes como javascript.

    €18 / hr (Avg Bid)
    €18 / hr licitátlag
    48 árajánlat

    I'm in need of a skilled programmer who can develop a software system that will replace an existing flash dongle licensing system. The primary goal of this software will be to manage and verify the licensing of our software. Essential Features: - Compatibility: The software must be Windows-compatible. - Licensing System: The software should implement a hardware-based activation system to ensure the protection of our software. Ideal Skills and Experience: - Proficient in software development for Windows environments. - Experience in developing hardware-based activation systems. - Knowledge of software licensing systems. - Strong understanding of encryption and security protocols. - Ability to create a user-friendly interface for license management. I'm looking for s...

    €481 (Avg Bid)
    €481 licitátlag
    32 árajánlat

    I'm in need of a game developer proficient in Adobe Flash, specifically for creating an Android puzzle game. Your tops skills should include game app development, integration of ANEs into the game application, as well as implementing In App Purchases and Rewarded Video Ads. The game should include: - 10-20 unique levels. - Feature of earning and collecting coins and points. - Successfully incorporating In App Purchases. - Including Rewarded Video Ads. Your previous experience in designing and developing Android puzzle games will be a plus. I am looking for individuals who can create engaging, challenging yet achievable game levels and can ensure smooth functionality of the integrated features.

    €2123 (Avg Bid)
    €2123 licitátlag
    5 árajánlat

    I'm looking for a talented developer to identify and fix a persistent issue in my web browser game developed using PHP, HTML5, JS, Flash and MySQL. I am encountering a problem in my game that causes the creatures not to load to the hunting screen and the fight sequence to not start. The error message that may indicate the problem is in the proxy error log, but it could be something different. In fact, these files are already working files, but I need someone who is an expert on the necessary adjustments. This issue occurs every time I try to start the fight and there is a warning that the connection to the fight server has been lost. 2024/04/13 09:08:09 [error] 13606#0: *56 openat() "/var/www/vhosts/example.com./httpdocs/fproxy/req62347" failed (2: No such file or dir...

    €24 (Avg Bid)
    €24 licitátlag
    15 árajánlat

    ...(similar to Reddit) on product page. h. Create a form with selection boxes which include Gender selection - I'll give you the options i. Show page with latest members that joined - Show Heading: Welcome to our newest members j. Direct all new members regardless of level to view membership video for orientation 4. Setup paid consultation which one can book time - 15 minutes, 30 minutes, 1hour a. flash alert on client and host's screen when 10, 5 and 1 minute of remaining session 5. Detect timezone based on visitor's ip. 6. Setup discussion group (like Reddit) with Moderators for each discussion group a. In order to join a discussion group, one MUST choose ONE option of interest b. Another selection category to show on Member Registration - Christian, Muslim, Oth...

    €360 (Avg Bid)
    €360 licitátlag
    18 árajánlat

    I require a minimalistic desktop application that can display a PDF file in full screen. This standalone EXE file should exist in the same directory as the pdf file itself. This application needs to be: -Compatible with the Windows operating system. -Incorporate user-friendly features like zoom controls and page navigation buttons. -Include a bookmarking feature for easy reference. This app would be a special pdf viewer file. Let us suppose, I have multiple pdf files in the same folder as the app, and with names that are prefixed with a number, eg. , , , .... When I run the app, it should be able to detect the presence of all the pdf files described above. The app should have 2 pairs of buttons, eg. Prev_file/Next_file & Prev_page/Next_page. Using the

    €159 (Avg Bid)
    €159 licitátlag
    52 árajánlat

    We are a Saudi company looking for FLASH USDT in quantities exceeding 30 million per week We need people to sell FLASH USDT honestly the conditions / 1_ Before the agreement, he must send a test to test the quality of the flash he owns, and then we complete the agreement. 2_ Payment USDT To connect on Telegram @abdullahabdo3

    €183259 (Avg Bid)
    €183259 licitátlag
    7 árajánlat

    Read and apply please bot applies wont be answered, type -dragon- on your first sentence avoid spam I need a software using opencv and c++ or phyton for image processing /object detection but i wont pay for any m...pay for any milestone before seeing a video demo work from freelancer many freelancers here make me create milestone after stops chatting. this is a long term work with many budgets soon, i dont want to work with a freelancer who asks thousands of usd milestone for only talking here, i want to see and believe that you can do the core version of the software, i dont as for source code or exe file firstly, i only want to see the video that you can do it, surely rightafter i pay what we agreed for. Please read and apply, and dont ask me same things again ...

    €2670 (Avg Bid)
    €2670 licitátlag
    55 árajánlat

    We're looking for a programmer with experience of the STM8 MCU. We've already created a program that works well, but flash memory is limited to 8KB and we don't have enough space to store our entire program. The current size of the compiled code is 10 KB. We're looking for a programmer capable of compacting our specific code and libraries used. Our current software includes the following libraries: - WS2812 addressable RGB LEDs - I2C - PWM

    €226 (Avg Bid)
    €226 licitátlag
    22 árajánlat

    I need assistance with compiling a C++ project using Ultimate++. - The project is written in C++ and r...in this language and the Ultimate++ framework. - You should have experience with compiling projects to ensure a smooth and successful build. - Please share your relevant experience with C++, Ultimate++, and compiling projects in your proposal. The project compiles to .exe file for the .exe to run a .dll library should be extracted to where the .exe file exists. Your job is to include the .dll and .pak file into the exe file at compile time so the .dll and .pak files will be included in the .exe file so just clicking the .exe file the program RUNS and there should be no need for extra extraction of any dll . NO money will be paid for incomplete...

    €25 (Avg Bid)
    €25 licitátlag
    17 árajánlat

    Hola se busca persona que pueda editar en photoshop

    €18 (Avg Bid)
    €18 licitátlag
    42 árajánlat

    I need a software application (.exe) that can automate the clicking on AdMob ads. The software should be able to perform this function on a loop, with the ability to control the frequency of clicks. Key requirements: - The software should be compatible with AdMob, the specified ad network. - The automation should be designed in a way that it doesn't violate any terms of service of the AdMob platform. - The application should be able to simulate human-like actions to avoid detection. Ideal skills and experience: - Proficiency in developing Windows software applications (.exe) - Strong understanding and prior experience with mobile ad networks, especially AdMob - Experience with creating automation scripts or applications - Knowledge of the best practices and potential ...

    €327 (Avg Bid)
    €327 licitátlag
    59 árajánlat

    It is just an automated batch login account, and then records and saves the information in this account. Please contact me for details.

    €15 / hr (Avg Bid)
    €15 / hr licitátlag
    35 árajánlat

    ...and IPC for process communication. Packaging: Package the application into an executable (.exe) file for user-friendly distribution. Specific Files and Roles: : Manages the main application process, window creation, and system-level operations. : Handles GUI events and user interactions within the application. : Safely exposes necessary Node.js or Electron functionality to the renderer. : Defines the structure and layout of the GUI. : Styles the GUI for a user-friendly experience. Others: Any additional files needed to support the application. Deliverables: Complete source code with detailed documentation for each component. The final executable file (.exe) ready for user installation. A comprehensive user guide detailing the use of the application

    €131 (Avg Bid)
    €131 licitátlag
    68 árajánlat

    I'm looking for a developer who can create stable FLASH coins on Ethereum for my exchange platform. The stable coins should have the following key features: - Low transaction fees - High transaction speed - Programmable smart contracts - Show Ledger wallet balance - Able to transfer to 2 different wallets The desired stability mechanism for these coins should be collateralized. Ideal skills and experience for this job include: - Strong understanding of blockchain technology, particularly Ethereum - Experience in developing stable coins - Ability to implement low transaction fees and high transaction speeds - Proficiency in creating programmable smart contracts - Familiarity with the FLASH concept of collateralized stability mechanisms Please only apply if you ha...

    €201 (Avg Bid)
    €201 licitátlag
    40 árajánlat

    ...Arbitrage Bot with Flash Loan Integration and Desktop User Interface **Project Description:** I'm seeking a skilled blockchain developer with strong Python expertise to build a cutting-edge cryptocurrency arbitrage bot. This bot will leverage flash loans for automated profitable trades on major decentralized exchanges. **Core Functionality:** * **Real-time Monitoring:** The code must continuously monitor cryptocurrency prices across all major decentralized exchanges (DEXs). * **Arbitrage Detection:** The bot will use Python for data analysis to identify profitable arbitrage opportunities where a significant price difference (exceeding 0.09% + gas fees) exists for the same cryptocurrency across different DEXs. * **Flash Loan Integration:** The bot will in...

    €567 (Avg Bid)
    €567 licitátlag
    94 árajánlat
    Sitio web de reservas Véget ért left

    ...cliente podrá entrar en una página () y, con el correo electrónico o teléfono, ver los datos de la reserva. 2) Panel de administración. Creación de un panel de administrador privado donde el administrador gestione las reservas. Este panel incluiría varios apartados: - Actividades: Lista de actividades y, cada actividad, con un calendario propio. En el calendario, poder añadir/editar/quitar los horarios manualmente. (Imagen 3) - Reservas: Tabla con la lista de clientes (nombre, actividad, fecha, etc.) - Otros apartados con tablas de la base de datos por definir **Por ahora no es necesario introducir una pasarela de pago en las actividades; simplemente un sistema de reservas/citas. **No tenemos preferencia por utilizar react...

    €548 (Avg Bid)
    €548 licitátlag
    106 árajánlat
    editar dossier pdf Véget ért left

    Necesito editar un dossier publicitario en formato pdf para incluir tres paginas nuevas, se aporta texto y fotografias. Solamente necesario maquetarlo de la misma manera que el resto de paginas del dossier

    €21 (Avg Bid)
    €21 licitátlag
    51 árajánlat

    As per our discussion...

    €33 (Avg Bid)
    €33 licitátlag
    1 árajánlat

    Buenos días, Me gastaría implementar una ruleta para que el usuario cuando entre a mi web pueda Girarla y ganar lo que le salga (Mi web esta hecha en WordPress) , deseo que pueda yo realizar cambios en la ruleta, también poder colocar porcentajes de probabilidad a cada...premio por ejemplo "descuento 2x1 - 50%" de probabilidad de ganar, cuando el usuario juegue solo podrá realizarlo una sola vez ( Me gustara que el usuario no deba registrarse ) y tambien en medio de la ruleta iria un espacio donde pondria cambiar imagenes, Luego que el usuario gane deberá dejar su correo y este correo me lo enviaría a mi con los datos de que premio gano y su correo ( SI es posible editar los campos de datos por si en un futuro quisiera poner para r...

    €9 / hr (Avg Bid)
    €9 / hr licitátlag
    31 árajánlat

    ...history is indispensable for analytics purposes and customer service. - Monitoring and tracking of customer log in and sales generated from patent affiliate site like Amazon, SEMrush, Hostinger , Flipkart , Ajio, Myntra, etc - Easy application for the affiliate program should be facilitated to introduce the potential of a wider clientele and to boost sales. - Display of promotional offers, enabling Flash Sales, incorporation of coupon system adds uniqueness to the website and fosters customer loyalty. - Fun features such as quizzes and prizes can significantly enhance user engagement and fun quotient of the site. Ideal Freelancer Skills: - Proven experience in e-commerce and affiliate marketing website development - Proficiency in creating user-friendly, detailed and dynamic we...

    €135 (Avg Bid)
    €135 licitátlag
    40 árajánlat

    ...attatched my previous Japanese presentation to let you know how I would like it to look(exactly similar template just change pictures to all One Piece related) -10 slides// -15% needs to be written in Japanese *hirigana* (as stated in the instructions attatched below) *my Professor/Sensei said it was okay to just do one section in Japanese *hirigana* -speaker notes/ a sсrіpt, i will be reading off flash cards so i need a full sсrіpt with also 15% Japanese *for the speaker notes, I am okay with writing it out in Romaji please bold the Japanese both in the speaker notes and in the powerpoint(as it says in instructions attatched) ***Romaji is the term for writing out Japanese in English using Roman letters.*** • I need the PowerPoint assignment completed by April 13, 2024. ...

    €69 (Avg Bid)
    €69 licitátlag
    54 árajánlat

    ¡Estamos buscando un/a montador/editor de vídeo para un proyecto en un canal de YouTube! Nos especializamos en la producción de contenido centrado en entrevistas en temas sociales y culturales. Si tienes una pasión por contar historias de manera creativa y efectiva, ¡esta oportunidad es para ti! Responsabilidades: *Editar videos sobre entrevistas siguiendo un guión proporcionado, utilizando los recursos entregados y adicionales que el montador proponga de acuerdo a la historia que se cuenta. *Trabajar de manera autónoma y creativa para dar un toque personal a cada vídeo. *Mantenerse actualizado con las últimas tendencias y dinámicas de videos para internet. *Cumplir con los plazos de entrega establecidos. *Colabo...

    €20 (Avg Bid)
    €20 licitátlag
    47 árajánlat

    Hello. I need a small program for win10 to open photos from a file, show them and describe the each picture. Load onem enter fields and then load the next. 3 values must be written to each line: Coins Title Description delimiter = ; MY INPUT FILE: 0list...002-aninamaus!up001;Coins;Title;Description Example: field1;field2;P:!CONTENT-MODELS-Teil1002-aninamaus!up001;20;Yellow Car;This car a very fast and beautiful field1;field2;P:!CONTENT-MODELS-Teil1002-aninamaus!up001;0;My food;This food is soo delicious but spicy. Please look an my photo how it the program should look like. I need the exe-file and the source code. Small project $15 When you bid please say "i love cats" because i ignore automatic bids. Thank you Best regards

    €33 (Avg Bid)
    €33 licitátlag
    18 árajánlat

    Soy médica y busco personal para ayudarme en el manejo de redes, sacar y/o editar fotos, manejar excel con costos de insumos, presupuestos, etc

    €9 / hr (Avg Bid)
    Helyi
    €9 / hr licitátlag
    24 árajánlat

    ...The token should be capable of creating new tokens to be added to the total supply. Burnable: It should allow tokens to be "burned", effectively removing them from the total supply. Pausable: The contract should enable transactions to be paused, a crucial feature for emergency or maintenance purposes. Permit: Implementing EIP-2612 permit function for allowing spending of tokens via signatures. Flash Minting: Ability to mint tokens temporarily within a transaction without permanent impact on the total supply. Access Control: The token must incorporate role-based access control mechanisms to grant different levels of permissions (e.g., admin, minter roles). Upgradeability: The smart contract should be upgradeable using the UUPS (Universal Upgradeable Proxy Standard) pat...

    €233 (Avg Bid)
    €233 licitátlag
    29 árajánlat

    ...The token should be capable of creating new tokens to be added to the total supply. Burnable: It should allow tokens to be "burned", effectively removing them from the total supply. Pausable: The contract should enable transactions to be paused, a crucial feature for emergency or maintenance purposes. Permit: Implementing EIP-2612 permit function for allowing spending of tokens via signatures. Flash Minting: Ability to mint tokens temporarily within a transaction without permanent impact on the total supply. Access Control: The token must incorporate role-based access control mechanisms to grant different levels of permissions (e.g., admin, minter roles). Upgradeability: The smart contract should be upgradeable using the UUPS (Universal Upgradeable Proxy Standard) pat...

    €150 (Avg Bid)
    €150 licitátlag
    9 árajánlat

    I need an exe/msi installer that installs my chrome extension .crx from the webstore automatically to the user browser.

    €456 (Avg Bid)
    €456 licitátlag
    43 árajánlat

    Necesito a alguien que sepa editar este tipo de fotografía. Urge.

    €83 (Avg Bid)
    €83 licitátlag
    61 árajánlat

    I am creating a .exe and .mac program that creates chords and melodies for a user. Right now its in four separate programs and want it into one, and to connect with each other (such as chords generated on the piano roll connect with the custom piano roll, and each chord works) Alongside this, more features on the piano roll such as moving the keys and deleting them and changing bpm is a requirement. The more features the better (such as resizing). I also have a collection of sounds and adding them in there instead of the default piano would be awesome. Making it look nice and professional with ttkthemes or possibly even PyQt would be awesome It must be able to download them as .midi files. It used to work (downloading midis) but not anymore. Also other glitches how such as some pr...

    €396 (Avg Bid)
    €396 licitátlag
    30 árajánlat
    marketing digital Véget ért left

    generar contenido publicitario para vender digitalmente un libro por hotmart. por otro lado editar con imagenes el libro en pdf.

    €388 (Avg Bid)
    €388 licitátlag
    43 árajánlat

    I'm searching for a skilled React Native developer to revamp the user interface of the invoice feature in my app, specifically the screen layout, to rectify the issue of inadequate information display. This upgrade involves making it more intuitive and user-frie...feature in my app, specifically the screen layout, to rectify the issue of inadequate information display. This upgrade involves making it more intuitive and user-friendly, improving how order information is displayed and accessed. The ideal candidate should possess strong experience in UI/UX design, React Native coding, and a proven track record of improving app functionality and aesthetics. flash list instead of flat list UI improvements customization option for status changes to add product modal bug fixes pdf...

    €41 (Avg Bid)
    €41 licitátlag
    15 árajánlat