Initial community documentation

Community documentation is being written in Markdown
format because we can leverage GitHub.com's ability
to render Markdown into HTML directly from files
in the repo.  Also, the GlusterFS Community project
has decided to use Markdown as an input into the
tool called pandoc which can convert the documents
into multiple formats.

Change-Id: Iec530f05a9a1ab3a95a1e97b791e8390068b99b4
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/5256
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Peter Portante <pportant@redhat.com>