Added back an example config for the Masa GUI.

Note: The ons-demo and Masa GUIs used to use the same config. The Masa GUI only
actually uses the 'cluster_basename' and 'controllers' fields. In the future
the GUI script should be refactored to not require all config parameters.

Change-Id: I3718536dbf12a71518204d3b2746c7afa4cae842
diff --git a/web/config.json.example b/web/config.json.example
new file mode 100644
index 0000000..5d98190
--- /dev/null
+++ b/web/config.json.example
@@ -0,0 +1,22 @@
+{
+    "LB": false, 
+    "TESTBED": "sw",
+    "ONOS_DEFAULT_HOST": "localhost",
+    "ONOS_GUI3_CONTROL_HOST": "http://gui3.onlab.us:8081", 
+    "ONOS_GUI3_HOST": "http://gui3.onlab.us:8080", 
+    "cluster_basename": "onos-vm", 
+    "controllers": [
+        "onos-vm1", 
+        "onos-vm2", 
+        "onos-vm3", 
+        "onos-vm4"
+    ], 
+    "core_switches": [
+        "00:00:00:00:ba:5e:ba:11", 
+        "00:00:00:00:00:00:ba:12", 
+        "00:00:20:4e:7f:51:8a:35", 
+        "00:00:00:00:ba:5e:ba:13", 
+        "00:00:00:08:a2:08:f9:01", 
+        "00:00:00:16:97:08:9a:46"
+    ]
+}