add documentation for built-in python help

[krichter722]

I'd be great to provide documentation when import kdenlive_tools; help(kdenlive_tools); is invoked (currently it's empty and I didn't find documentation anywhere else). The project is a great idea and I'd appreciate to get started even with the tiniest bit of a development version (maybe the project is already much more advanced and I just didn't find the right resources :) )!