Add comments on how to run devstack with Quantum

Fixes bug 1077826

Change-Id: I224db4e00e3c937f3106e9a099b79de789be1fc1
diff --git a/stackrc b/stackrc
index 34ccfa2..f35cdc0 100644
--- a/stackrc
+++ b/stackrc
@@ -20,7 +20,18 @@
 # screen tabs. To change the default list, use the ``enable_service`` and
 # ``disable_service`` functions in ``localrc``.
 # For example, to enable Swift add this to ``localrc``:
-# enable_service swift
+#  enable_service swift
+# In order to enable Quantum (a single node setup) add the following
+# settings in `` localrc``:
+#  disable_service n-net
+#  enable_service q-svc
+#  enable_service q-agt
+#  enable_service q-dhcp
+#  enable_service q-l3
+#  enable_service q-meta
+#  enable_service quantum
+#  # Optional, to enable tempest configuration as part of devstack
+#  enable_service tempest
 ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-obj,n-cpu,n-net,n-cond,cinder,c-sch,c-api,c-vol,n-sch,n-novnc,n-xvnc,n-cauth,horizon,rabbit,tempest,mysql
 
 # Set the default Nova APIs to enable