Epic: creating dwylchat

As explained in: https://github.com/dwyl/chat/issues/41 we are creating the front end (as much as we can) for dwylchat in this repo. We have created a staging branch to make PRs to so that we can create feature branches off of the staging branch and PR back to it, to have as good of a workflow as possible.

So we need to list what we need to do:
- [ ] Initial design of the chat #98
- [ ] Component: online users widget #97
- [ ] Component: actual chat (input and message list)
- [ ] Component: room/type of chat list
- [ ] Feature: Store chat history locally and update with call to back end for list of messages.
- [ ] Feature: Scroll chat down so new messages stay in view when scrolled to bottom, maintain scroll position if scrolled further up
- [ ] Feature: Notify user when new messages are available

(more to be added as we think of them)