Print some tips for new users

mw can be confusing if you've never used it before:

CHANGE: Created user newuser: John Doe newuser@example.com
CHANGE: Auto-registered newuser
SYSTEM: newuser has just entered the board.
newuser has just joined talker room 0
newuser: who
newuser: /who
newuser: ?
newuser: exit
SYSTEM: newuser's connection has just dropped.

so it should print some brief getting started tips for new users. How to quit, how to start chatting and how to find more help should be the main points.