Add instructions for setting up Discord bot

Author: medeor413

DISCORD_BOT_SETUP.md

@@ -0,0 +1,29 @@
+# StarryPy Discord Bot
+
+StarryPy includes a plugin that allows you to connect a bot to a Discord 
+server that will relay messages between the Starbound and Discord servers. 
+If the IRC bot also included with StarryPy is enabled, the Discord and IRC 
+plugins will also relay messages between each other.
+
+## Using the Discord Bot
+The Discord bot plugin uses the [discord.py](https://github.com/Rapptz/discord.py)
+library, and will not work without it.
+
+To use the Discord bot, you will need to create a Discord application. Go to 
+[this page](https://discordapp.com/developers/applications/me) and click the
+ "New Application" button.
+ Give your bot a descriptive name; giving it an avatar or description is optional.
+ 
+ Once you have created your application, you must create a bot user by clicking the "Create a Bot User" option on 
+ the application's page.
+ 
+ To add the bot to your server, go to `https://discordapp.com/oauth2/authorize?&client_id=CLIENT_ID&scope=bot&permissions=0`
+ (replacing `CLIENT_ID` with your application's client ID) and add the 
+ bot to your server.
+ 
+ Once the bot is added to your server, copy the token 
+ and client id from the application to the fields in config.json. Get the 
+ channel id for a given channel by enabling Developer Mode in 
+ Discord, right-clicking a channel, and clicking "Copy ID," then paste this 
+ ID into the "channel" field in config.json. Your bot should now be fully 
+ configured and ready to use.

OPTIONAL_REQUIREMENTS

@@ -1,2 +1,2 @@
-tornado
-irc3
+irc3
+discord.py

plugins/discord_bot.py

@@ -147,7 +147,7 @@ def on_client_disconnect_request(self, data, connection):
 
     def on_chat_sent(self, data, connection):
         """
-        Hook on message being broadcast on server. Display it in IRC.
+        Hook on message being broadcast on server. Display it in Discord.
 
         If 'sc' is True, colors are stripped from game text. e.g. -