added more info to MANUAL -- please review and modify as appropriate

MANUAL

@@ -315,3 +315,30 @@ Setting up a multiplayer game
 
   Step 4: click [I'm Ready].
 
+
+CAMPAIGN SERVER
+
+You can fetch additional campaigns by selecting Campaign from the title
+screen, and in the campaign menu, selecting Get More Campaigns.  This
+will attempt to make a TCP connection to port 15002 of the campaign
+server (campaigns.wesnoth.org) so you need to ensure your firewall
+allows this.  The campaigns are contributed by users and not all will
+work properly on the current release of the game -- check the forums at
+if you are having problems.
+
+
+OTHER RESOURCES
+
+In-game Help is available in scenarios, press the Help hotkey or select
+Help from the menu.  The overall homepage of the project is at
+http://www.wesnoth.org/ and this links to many other pages related to
+the game.  Of these, our wiki at http://wiki.wesnoth.org/ contains
+contributed walkthroughs and tips for playing the game, the unit
+advancement tree, information about making your own scenarios and
+campaigns, how to contribute as a developer or a translator, and much
+more.  You can also join us to chat on IRC at irc.wesnoth.org in channel
+#wesnoth or join our forum community at http://forum.wesnoth.org/ where
+you can discuss the game with over 2000 forum members.  The forums also
+contain a searchable archive of tens of thousands of posts, spanning
+over two years -- an invaluable source of information.
+