add missing template unauthorized.html. ready for merge

- Legacy-Id: 7213

ietf/secr/templates/unauthorized.html

@@ -0,0 +1,17 @@
+{% extends "base_site.html" %}
+
+{% block title %}Unauthorized{% endblock %}
+
+{% block content %}
+
+<H2>Unauthorized</h2>
+
+<h3>
+{% if user_name %}
+    Sorry, {{ user_name }}, you are not authorized{% if group_name %} to access Group: {{ group_name }}{% else %} to access this page.{% endif %}
+{% else %}
+    <p>Login invalid</p>
+{% endif %}
+</h3>
+
+{% endblock %}