CORD-772 Example UI Extension

Change-Id: I66f9236620a56219cc84a5f7ed5be719751db3bd
diff --git a/src/app/components/demo.html b/src/app/components/demo.html
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+<section class="content">
+  <div class="container-fluid">
+    <div class="row">
+      <div class="col-xs-12">
+        <h1>Xos Sample GUI Extension</h1>
+      </div>
+      <div class="col-xs-12">
+        <p>This page is loaded from an external container!</p>
+      </div>
+      <div class="col-xs-12">
+        From this extension you can use all the feature provided by the core, <br/>
+        for example you can toggle the side panel injecting custom content.
+        <br/>
+        <br/>
+        <a ng-click="vm.togglePanel()" class="btn btn-success">Open Side Panel</a>
+      </div>
+    </div>
+  </div>
+</section>
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