riversong code showcase

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

@@ -0,0 +1,14 @@
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class Entity
+    {
+        public const int InvalidId = 0;
+
+        public int Id { get; private set; }
+
+        public static T Create<T>(int id) where T : Entity, new()
+        {
+            return new T { Id = id };
+        }
+    }
+}