Added custom gamemode info

and rearranged game mode table by category

lgsm/config-default/config-lgsm/csgoserver/_default.cfg

@@ -11,11 +11,12 @@
 ## Server Start Settings | https://github.com/GameServerManagers/LinuxGSM/wiki/Start-Parameters
 # https://developer.valvesoftware.com/wiki/Counter-Strike:_Global_Offensive_Dedicated_Servers#Starting_the_Server
 # [Game Modes]			gametype	gamemode
-# Arms Race				1			0
 # Classic Casual		0			0
 # Classic Competitive	0			1
+# Arms Race				1			0
 # Demolition			1			1
 # Deathmatch			1			2
+# Custom				3			0
 gametype="0"
 gamemode="0"
 mapgroup="mg_active"