update models + added social network account services

lib/User/Contracts/AuthClientInterface.php

@@ -0,0 +1,17 @@
+<?php
+namespace Da\User\Contracts;
+
+use yii\authclient\ClientInterface;
+
+interface AuthClientInterface extends ClientInterface
+{
+    /**
+     * @return string|null email
+     */
+    public function getEmail();
+
+    /**
+     * @return string|null username
+     */
+    public function getUserName();
+}