!info is mine, and poorly documented I'll admit.
In your base folder, create a new folder called info.
Create a new text file in that folder called info-default.txt, this will get printed when someone uses !info with no arguments.
You can also create other files, like info-rules.txt or info-maps.txt, which will be printed when someone does !info rules or !info maps, for example.
There's other neat stuff you can do, but it's kinda complicated so I won't get into it here. If/when I finish writing my docs, I'll edit in a link.