Add a lambda command

Author: ethanhann

src/InEngine.Core/Commands/Lambda.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace InEngine.Core.Commands
+{
+    public class Lambda : AbstractCommand
+    {
+        public Action Action { get; set; }
+        public override void Run()
+        {
+            Action.Invoke();
+        }
+    }
+}