README: Added note about third-party plugins.

README.md

@@ -7,6 +7,8 @@ need `easy_install` instead of `pip`.
 The extras directory contains plugins I would not advice you use unless you further improve them or
 just use them for the purpose of learning.
 
+This repository only contains plugins maintained by me. Take a look [here](https://github.com/MinoMino/minqlx/wiki/Useful-Plugins) some of the plugins by other users that could be useful to you.
+
 If you have any questions, the IRC channel for the old bot,
 [#minqlbot on Quakenet](http://webchat.quakenet.org/?channels=minqlbot),
 is being used for this one as well. Feel free to drop by.