Documentation

[s-sajid-ali]

Add documentation for how we have diverged from upstream to help us debug any issues that come up in the future.

[s-sajid-ali]

Developer documentation is at https://github.com/NYU-RTS/rts-coldfront/wiki

User documentation is being worked on in NYU-RTS/rts-docs#83

[s-sajid-ali]

Remaining items addressed in NYU-RTS/rts-docs#123