Add list of broken module

We are looking for contributors to help updating them for latest ejabberd.

README-broken.md

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+This is the list of modules that are known to be broken with latest ejabberd master branch.
+
+If you feel they are worth it, your help to fix them is welcome:
+
+ - atom_pubsub: "The atom_pubsub module provides access to all PEP nodes via an
+   AtomPub interface."
+ - ircd: "This is an IRC server frontend to ejabberd."
+ - mod_archive: "Message Archiving (XEP-0136)"
+ - mod_openid: "Transform the Jabber Server in an openid provider."
+ - mod_profile: "User Profile (XEP-0154) in Mnesia table"