Documentation of repository

[aldobarriente]

I need to go back and provide documentation for our entire repo. This will be helpful for those (like Winnie) who are setting up XSLT files for our primary editions. In addition, because our text uses TEI as opposed to most CTS texts which use Epidoc, it is harder to find documentation on proper encoding of TEI texts. This would relieve the burden of others having to dig through dense testing repos for CTS-compliant texts.