Added TODO marker w.r.t. needed Jitsi infrastructure.

src/net/java/sip/communicator/impl/protocol/irc/PresenceManager.java

@@ -20,6 +20,8 @@
  * 'a' used for other purposes. This may be one of those ambiguous letters that
  * every server interprets differently.)
  *
+ * TODO Jitsi is currently missing support for presence in MUC (ChatRoomMember).
+ *
  * TODO Monitor presence using ISON, WATCH or MONITOR. (Monitor does not seem to
  * support away status, though)
  *