CORD-3145 Add ExampleService to guide

Change-Id: Idd6970bf105a860fa391383bf1485bcdd7615506
diff --git a/git_refs b/git_refs
index fcadce1..7faa57f 100644
--- a/git_refs
+++ b/git_refs
@@ -21,6 +21,7 @@
 openstack             /docs    master
 rcord                 /docs    master
 simpleexampleservice  /docs    master
+exampleservice        /docs    master
 vrouter               /docs    master
 xos-gui               /docs    master
 xos-tosca             /docs    master