GUI -- Sketched out structure for multi-views; each with own controller, template html and css.
- routes currently hard-coded... some thought needed to handle views contributed at runtime.

Change-Id: Ied012744d74e46c5072143283364557f9485056c
diff --git a/web/gui/src/main/webapp/app/view/sample/sample.html b/web/gui/src/main/webapp/app/view/sample/sample.html
new file mode 100644
index 0000000..113b725
--- /dev/null
+++ b/web/gui/src/main/webapp/app/view/sample/sample.html
@@ -0,0 +1,18 @@
+<!-- Sample partial HTML -->
+<div id="ov-sample">
+    <h2> A Sample View </h2>
+
+    <img class="logo" src="../data/img/onos-logo.png">
+
+    <p>
+        This is a <i>view</i> distinct from the Topology viewer,
+        to help facilitate development of the navigation model.
+    </p>
+    <p>
+        A message from the controller:
+        <span class="msg">{{ ctrl.message }}</span>
+    </p>
+    <p>
+        Try visiting the <a href="#/topo">Topology View</a>.
+    </p>
+</div>