riversong code showcase

Source/Engine/Core/Attributes/GameSystemGroupAttribute.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class GameSystemGroupAttribute : Attribute
+    {
+        public GameSystemGroupAttribute(Type systemGroupType)
+        {
+            SystemGroupType = systemGroupType;
+        }
+
+        public Type SystemGroupType { get; set; }
+    }
+}