First commit of relational example

examples/relational/Storage/RefreshTokenStorage.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace RelationalExample\Storage;
+
+use League\OAuth2\Server\Storage\RefreshTokenInterface;
+use League\OAuth2\Server\Storage\Adapter;
+
+class RefreshTokenStorage extends Adapter implements RefreshTokenInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function get($token)
+    {
+        die(var_dump(__METHOD__, func_get_args()));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function create($token, $expireTime, $accessToken)
+    {
+        die(var_dump(__METHOD__, func_get_args()));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function delete($token)
+    {
+        die(var_dump(__METHOD__, func_get_args()));
+    }
+}