docs: Add SSH guide

This is really easy win for people using DevStack for the first time.

Change-Id: I8de2d4d115d34e9d87dd461016b5b894d3f000e7
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
diff --git a/doc/source/index.rst b/doc/source/index.rst
index a5a11e2..70871ef 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -133,6 +133,8 @@
 You can ``source openrc`` in your shell, and then use the
 ``openstack`` command line tool to manage your devstack.
 
+You can :ref:`create a VM and SSH into it <ssh>`.
+
 You can ``cd /opt/stack/tempest`` and run tempest tests that have
 been configured to work with your devstack.