add Notes

backend/modules/notes/Notes.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace backend\modules\notes;
+
+/**
+ * notes module definition class
+ */
+class Notes extends \yii\base\Module
+{
+    /**
+     * {@inheritdoc}
+     */
+    public $controllerNamespace = 'backend\modules\notes\controllers';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        parent::init();
+
+        // custom initialization code goes here
+    }
+}