Add online documentation

[orbeckst]

There should be basic documentation for the package, generated from the doc strings using sphinx.

The docs can also contain examples #6 .

[orbeckst]

You can either host the docs on readthedocs (create the kda project there in order to grab the name until someone else does!) or as GitHub pages.

I recommend starting with a simple sphinx setup (do a sphinx-quickstart in a docs directory) and then just keep adding.

I recently did this from scratch for propka (see https://github.com/jensengroup/propka/tree/master/docs) with minimal effort - see the rendered docs at https://propka.readthedocs.io/

[orbeckst]

Cookiecutter already gave you everything that you need — just add to your docs directory!