Add missing license notice to ResourceClaim.cs

OpenRA.Mods.RA/World/ResourceClaim.cs

@@ -1,4 +1,14 @@
-namespace OpenRA.Mods.RA
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+namespace OpenRA.Mods.RA
 {
 	public sealed class ResourceClaim
 	{