RFC: Improve doc

[lambdalisue]

Like #11 (comment)

But....... Well........ English.....

How to add document

From source code

1. Write docstring to source code files like registration/backends/defalt/__init__.py

2. Run

   $ sphinx-apidoc -f -o docs/ src
   $ (cd docs; make html)

Document

1. Write reStructuredText like docs/about_registration_supplement.rst
2. Run $ (cd docs; make html)

[mick-t]

I will help with this.

[mick-t]

Are the rst automatically generated? If they are, how to rebuild them?

[lambdalisue]

Thanks for the contribution!

If you modify docstring in source code, you need to run

$ sphinx-apidoc -f -o docs/ src

To apply the changes ;-)