added README file for the IRC addon

diff --git a/irc/README.md b/irc/README.md
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+IRC App
+=======
+
+This addon will add an app to your page which will allow your users to access
+the [IRC](https://en.wikipedia.org/wiki/IRC) at [freenode.net](https://freenode.net) via a webinterface from your node. The chat interface
+will be loaded in an iframe from webchat.freenode.net.
+
+You can specify two sets of channel lists.
+
+1. a list of channels the interface shall automatically connect to
+2. a list of popular channels which will be displayed aside the chat interface.
+   the channels in this list will be linked so your users can easily join them.
+
+If you don't specify a list of popular channels, the following will be shown: friendica, chat, chatback, hottub, ircbar, dateroom, debian