start a restructure

Behavioral/Command/CommandInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace DesignPatterns\Command;
+
+/**
+ * class CommandInterface
+ */
+interface CommandInterface
+{
+    /**
+     * this is the most important method in the Command pattern,
+     * The Receiver goes in the constructor.
+     */
+    public function execute();
+}