Introduce ResponseModesEnum

Author: cicnavi

src/Codebooks/ResponseModesEnum.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\OpenID\Codebooks;
+
+enum ResponseModesEnum: string
+{
+    case Query = 'query';
+
+    case Fragment = 'fragment';
+
+    case FormPost = 'form_post';
+}