riversong code showcase

Source/Riversong/Game/CommonServices/Entities/IEntityCollectionCallbacks.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public interface IEntityCollectionCallbacks
+    {
+        public void OnAdded(Entity entity);
+
+        public void OnRemoved(Entity entity);
+    }
+
+    public interface IEntityCollectionCallbacks<out T> : IEntityCollectionCallbacks
+    {
+        event Action<T> Added;
+
+        event Action<T> Removed;
+    }
+}