message: Add sample config for UserActivityTracker
diff: @@ -570,6 +570,12 @@ ircService:
  # Maximum number of montly active users, beyond which the bridge gets blocked (both ways)
  # RMAUlimit: 100
  + # userActivity:
  + # The "grace period" before we start counting users as active
  + # minUserActiveDays: 1
  + # Time before users are considered inactive again
  + # inactiveAfterDays: 30
  +
  ircHandler:
  # Should we attempt to match an IRC side mention (nickaname match)
  # with the nickname's owner's matrixId, if we are bridging them?
  