Add config files for Discord connection (servers, server channels, etc.)

[sh0ckR6]

Having config files would be necessary to allow other users to change which channels the chat messages go to/read from

[sh0ckR6]

Looping back around to this project because I have nothing better to do at 1 AM and I want to work on this, a good way to go about doing this would be to have a list of channel ids that the plugin can send all chat messages to via a bot.

Something like this layout:

channels:
  - <channel-id1>
  - <channel-id2>

Might split out the bot into it's own project, or I might just leave it in here as a submodule. I'll see how things go with the bot development.