add events + more wip classes

lib/User/Event/UserEvent.php

@@ -0,0 +1,24 @@
+<?php
+namespace Da\User\Event;
+
+use Da\User\Model\User;
+use yii\base\Event;
+
+class UserEvent extends Event
+{
+    const EVENT_BEFORE_CREATE = 'beforeCreate';
+    const EVENT_AFTER_CREATE = 'afterCreate';
+
+    protected $user;
+
+    public function __construct(User $user, array $config = [])
+    {
+        $this->user = $user;
+        parent::__construct($config);
+    }
+
+    public function getUser()
+    {
+        return $this->user;
+    }
+}