start a restructure

Behavioral/Command/Receiver.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace DesignPatterns\Command;
+
+/**
+ * Receiver is specific service with its own contract and can be only concrete
+ */
+class Receiver
+{
+    /**
+     * @param string $str
+     */
+    public function write($str)
+    {
+        echo $str;
+    }
+}