added views and Authclients

lib/User/AuthClient/Twitter.php

@@ -0,0 +1,26 @@
+<?php
+namespace Da\User\AuthClient;
+
+use Da\User\Contracts\AuthClientInterface;
+
+
+class Twitter extends \dektrium\user\clients\Twitter implements AuthClientInterface
+{
+    /**
+     * @return string
+     */
+    public function getUsername()
+    {
+        return isset($this->getUserAttributes()['screen_name'])
+            ? $this->getUserAttributes()['screen_name']
+            : null;
+    }
+
+    /**
+     * @return null Twitter does not provide user's email address
+     */
+    public function getEmail()
+    {
+        return null;
+    }
+}