This is basically the reference config file translated to rst.
This also makes some minor updates to the reference config file.
Change-Id: I6aa3f9a7410a219ad00cee827ac4c273cf54bff5
Add some actual sphinx documentation. This is basically the README
split up into sections. Once this is actually published somewhere,
we can remove some of the content from the README and link to an
on-line reference instead.
Change-Id: I25e5ff842e94a5a05aa62c164952df93efc49e98