Add IRC chat info to README

The best way is to use ssh + screen + irssi => http://quadpoint.org/articles/irssi/
http://johnsenf.blogspot.com/2013/01/cheat-sheet-ssh-screen-irssi.html
http://matthewhutchinson.net/2010/8/21/irssi-screen-fnotify-and-growl-on-osx

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