FEATURE: prepare class structure for menu widget.

app/Handlers/Registrators/MenuExtensionRegistrator.php

@@ -0,0 +1,20 @@
+<?php
+namespace App\Handlers\Registrators;
+
+use App\Widgets\Contracts\MenuExtensionHandler;
+
+class MenuExtensionRegistrator {
+
+    protected $menuExtensions;
+
+    /**
+     * @param MenuExtensionHandler $handler
+     */
+    public function register(MenuExtensionHandler $handler) {
+        $this->menuExtensions[] = $handler;
+    }
+
+    public function get(){
+        return $this->menuExtensions;
+    }
+}