I'm doing an integration with the Google Docs (GData) API. Though I can't figure some things out (like how to add contributors to a Document).

I need someone that knows the Google Docs API with the .NET Framework (located here: http://code.google.com/apis/documents/docs/2.0/developers_guide_dotnet.html)

I need a C# class that has a few simple functions:

1.) Authenticate
2.) Upload a Document from a FileUpload control (returns the URL to the document)
3.) Add Collaborators to a Document
4.) Edit sharing permissions to a Document

Please make sure that you already have worked with the Google Docs API, I do not want to pay someone to "learn" it!

Thanks for reading!!!