Custom Chrome Extension To Integrate With Basecamp

Need to create a custom Chrome extension that will integrate with Basecamp via their API @ [login to view URL] Once integrated, the extension will add an additional 'Estimated Hours: [input]' section to every 'To-Do' in the project. This will allow the user to enter a decimal value, which will then be stored in a MySQL database (access will be provided) with the following minimum fields: user_id project_id task_id estimated_hours created_at updated_at User should have the ability to edit the stored estimated hours value as well. There are a number of existing extensions which perform this function already which can help provide guidance if necessary such as @ [login to view URL] See attached screenshot for an example of the way the additional input should appear for each To-Do. That is the only requirement, and ideally looking to work with someone who has experience creating Chrome plugins and/or familiar with Basecamp 3 API. Please feel free to ask questions if the requirements are unclear.