Add documentation to readthedocs

[hammer]

Some tips at https://codeandchaos.wordpress.com/2012/07/30/sphinx-autodoc-tutorial-for-dummies

What I did:

• Install sphinx
• Make docs/ and run the quickstart
• Run sphinx-apidoc from project root and send output to docs/
• Edit conf.py to look in project root index.rst to include modules

[hammer]

@iskandr @armish can one of y'all add me as an owner for the project? I'm jeff.hammerbacher on RTD.

[hammer]

Current RTD builds (e.g. https://readthedocs.org/projects/pyensembl/builds/3852559/) are failing because installing our dependencies takes too long; cf. readthedocs/readthedocs.org#1767.

[armish]

Just added you as an admin to the project 👍

[iskandr]

@hammer I think it's also failing because of dependencies on C extensions.

[ivirshup]

Would be really great if this could be implemented! This package could be quite useful to some projects I'm working on, but it's little difficult to figure out what functionality it provides.

I think build times for this package and readthedocs tooling have both improved considerably since this issue was raised. Happy to help if there's any way I can.