CORD-3028 simple example service

Change-Id: I48ed0e9af080fbfed50b5bd2a9790652d3c907d8
diff --git a/xos/synchronizer/model_policies/index.html.j2 b/xos/synchronizer/model_policies/index.html.j2
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+
+{#
+Copyright 2017-present Open Networking Foundation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+#}
+
+<html>
+<body style="background-color:{{ background_color }};">
+<font color="{{ foreground_color }}">
+
+<h1>ExampleService</h1>
+
+<ul>
+<li>Service Message: "{{ service_message }}"</li>
+<li>Tenant Message: "{{ tenant_message }}"</li>
+</ul>
+
+{% if images %}
+<h2>Some images</h2>
+{% for image in images %}
+<img name="{{ image.name }}" href="{{ image.url }}">
+{% endfor %}
+{% endif %}
+
+</font>
+
+</body>
+</html>