Add userkey_manager_interface

classes/userkey_manager_interface.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: dmitriim
+ * Date: 16/08/2016
+ * Time: 15:23
+ */
+
+namespace auth_userkey;
+
+
+interface userkey_manager_interface {
+    /**
+     * Create a user key.
+     *
+     * @return string Generated key.
+     */
+    public function create_key();
+
+    /**
+     * Delete a user key.
+     */
+    public function delete_key();
+
+}