New entities, traits and interfaces

src/Entities/Interfaces/ScopeEntityInterface.php

@@ -0,0 +1,17 @@
+<?php
+namespace League\OAuth2\Server\Entities\Interfaces;
+
+interface ScopeEntityInterface
+{
+    /**
+     * Get the scope's identifier
+     * @return string
+     */
+    public function getIdentifier();
+
+    /**
+     * Set the scope's identifier
+     * @param $identifier
+     */
+    public function setIdentifier($identifier);
+}