doc: Added mds page for ceph-deploy.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/rados/deployment/ceph-deploy-mds.rst b/doc/rados/deployment/ceph-deploy-mds.rst
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+============================
+ Add/Remove Metadata Server
+============================
+
+With ``ceph-deploy``, adding and removing metadata servers is a simple task. You
+just add or remove one or more metadata servers on the command line with one
+command.
+
+.. note:: CephFS is in production using 1 metadata server per cluster. You
+   **MUST** deploy at least one metadata server to use CephFS.
+
+See `MDS Config Reference`_ for details on configuring monitors.
+
+
+Add a Metadata Server
+=====================
+
+Once you deploy monitors and OSDs you may deploy the metadata server(s). ::
+
+       ceph-deploy mds create {host-name}[:{daemon-name}] [{host-name}[:{daemon-name}] ...]
+
+You may specify a daemon instance a name (optional) if you would like to run
+multiple daemons on a single server.
+
+
+Remove a Metadata Server
+========================
+
+If you have a metadata server in your cluster that you'd like to remove, you may use 
+the ``destroy`` option. :: 
+
+       ceph-deploy mds destroy {host-name}[:{daemon-name}] [{host-name}[:{daemon-name}] ...]
+
+You may specify a daemon instance a name (optional) if you would like to destroy
+a particular daemon that runs on a single server with multiple MDS daemons.
+
+.. note:: Ensure that if you remove a metadata server, the remaining metadata
+   servers will be able to service requests from CephFS clients. If that is not
+   possible, consider adding a metadata server before destroying the metadata 
+   server you would like to take offline.
+
+
+.. _MDS Config Reference: ../../../cephfs/mds-config-ref