Added instructions on how to run a dedicated server

doomsday/README

@@ -82,8 +82,34 @@ RUNNING A DEDICATED SERVER
 
 Start the game as you normally would, but use the "-dedicated" command
 line option.  This will make Doomsday run in a text-only console mode.
-For instructions on how to configure the server, see Doc/Network.txt.
+For more instructions on how to configure the server, see
+Doc/Network.txt.
 
-Quick instructions:
+Brief instructions:
 
+	1. Start with the "-dedicated" command line option.
 
+	2. Configure the TCP (cvar "net-port-control") and UDP (cvar
+	   "net-port-data") port numbers.  The TCP port is used for
+	   accepting new clients.  The UDP port is used for data
+	   traffic.  The default port number is 13209 for both TCP and
+	   UDP.  This step has to be done only once because the port
+	   numbers are saved into the config file.
+
+	3. "net init tcpip"
+
+	4. "net server start"
+
+	5. The current map can be changed with the "setmap" console
+	   command.
+
+	6. The server can be stopped with the command "net server
+	   stop".  If you wish to exit the program completely, use the
+	   command "quit".
+
+Even briefer instructions:
+
+	1. Make sure you have already configured the TCP/UDP port
+	   numbers.
+
+	2. Start with the command line options "-dedicated -server".