Update README.md

Added prerequisites and config info.

README.md

@@ -1,6 +1,11 @@
 # MediaFixer
 
-Auto changes twitter.com links on Discord to fxtwitter.com (or any other of your choice), embedding media correctly
+Auto changes links that commonly embed incorrectly (or not at all) on Discord to various embed services, embedding media correctly
+
+## Prerequisites
+
+- Node.js v16.17>
+- A discord bot with bot user, Message Content Intent enabled, permissions integer 92160 (Text Permissions: Send Messages, Manage Messages, Embed Links and Read Message History) and bot scope (basically just invite the bot to your server using this link https://discord.com/api/oauth2/authorize?client_id=YOUR_APPLICATION_ID&permissions=92160&scope=bot).
 
 ## Deployment
 
@@ -20,3 +25,24 @@ Edit  `config.json` to include your bot token.
 Deploy by running the following command:
 
 	node .
+
+## Configuration
+
+Edit `config.json`
+
+	nano config.json
+
+The value for `token` must be the bot token found here: https://discord.com/developers/applications/YOUR_APPLICATION_ID/bot
+
+Example:
+	
+	"token": "Ysy._94ZUE7oATq9DCyaYr47.iQRJGwysWgP7SwpONUen9YbJZpXV_eG_43MjaYESEoI9UpAr",
+	
+You can change which service to use for parsing Twitter and Instagram links. By default fxtwitter and ddinstagram are used, but you can change this to any of your choosing.
+
+Example:
+
+	"tweetParser": "https://twittpr.com/",
+	"instaParser": "https://ddinstagram.com/"
+	
+It's important the full base url is in the string, like the example above, otherwise you may run into issues.