add receiving end of CreateGroup order

OpenRA.Game/OpenRA.Game.csproj

@@ -84,6 +84,7 @@
     <Compile Include="Traits\AI\EmitInfantryOnSell.cs" />
     <Compile Include="Traits\AI\ReturnOnIdle.cs" />
     <Compile Include="Traits\Attack\AttackLeap.cs" />
+    <Compile Include="Traits\Player\ActorGroupProxy.cs" />
     <Compile Include="Traits\Player\PlayerResources.cs" />
     <Compile Include="Traits\RevealsShroud.cs" />
     <Compile Include="Traits\Player\ConquestVictoryConditions.cs" />

OpenRA.Game/Traits/Player/ActorGroupProxy.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRA.Traits
+{
+	class ActorGroupProxyInfo : TraitInfo<ActorGroupProxy> { }
+
+	class ActorGroupProxy : IResolveOrder
+	{
+		public void ResolveOrder(Actor self, Order order)
+		{
+			if (order.OrderString == "CreateGroup")
+			{
+				/* create a group */
+
+			}
+		}
+	}
+}