Add docs for Vagrant ONAP example usages

This patch adds documentation on example usages of
Vagrant ONAP.

Change-Id: I434d3b9f43d83d845c11627c10b00362ec4b1ea7
Issue-Id: INT-238
Signed-off-by: Shashank Kumar Shankar <shashank.kumar.shankar@intel.com>
diff --git a/bootstrap/vagrant-onap/doc/source/features/features.rst b/bootstrap/vagrant-onap/doc/source/features/features.rst
index d35c595..2f88c52 100644
--- a/bootstrap/vagrant-onap/doc/source/features/features.rst
+++ b/bootstrap/vagrant-onap/doc/source/features/features.rst
@@ -10,6 +10,7 @@
    openstack.rst
    consuming_scripts.rst
    configure_execution.rst
+   example_usage.rst
 
 This chapter explains how to use ONAP on Vagrant Advanced features
 like different providers.