Quick start guide

Added a quick start guide based on Grizzly stable, which
makes it easy to install and use while Havana is still
under development.

Change-Id: Id14ba86fd3823570f689b4bc8850af5ef5b89211
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/5791
Reviewed-by: Ramana Raja <rraja@redhat.com>
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Prashanth Pai <ppai@redhat.com>