Added dockerized version and added Channel/Room selector from Django_…

[coleyr]

…Channels demo.

I really love this use of Django Channels and I thought this was a super clever project. I dockerized the application using Docker-Compose. Also I added the ability for the user to choose the room. I mostly copied and pasted from the demo of the Django-Channels and used the built in index provided there. I left the folder mysite un changed only the mysite in the web folder was altered.