Add chimo's Nodeinfo plugin as a default GNU social plugin

plugins/Nodeinfo/actions/nodeinfojrd.php

@@ -0,0 +1,17 @@
+<?php
+
+if (!defined('GNUSOCIAL')) {
+    exit(1);
+}
+
+class NodeinfoJRDAction extends XrdAction
+{
+    const NODEINFO_2_0_REL = 'http://nodeinfo.diaspora.software/ns/schema/2.0';
+
+    protected $defaultformat = 'json';
+
+    protected function setXRD()
+    {
+        $this->xrd->links[] = new XML_XRD_Element_link(self::NODEINFO_2_0_REL, common_local_url('nodeinfo_2_0'));
+    }
+}