merge from master

Behavioral/Memento/Memento.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace DesignPatterns\Behavioral\Memento;
+
+class Memento
+{
+    /* @var mixed */
+    private $state;
+
+    /**
+     * @param mixed $stateToSave
+     */
+    public function __construct($stateToSave)
+    {
+        $this->state = $stateToSave;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getState()
+    {
+        return $this->state;
+    }
+}