:doc: Added index/toctree page for cluster ops.

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

diff --git a/doc/cluster-ops/index.rst b/doc/cluster-ops/index.rst
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+====================
+ Cluster Operations
+====================
+
+.. raw:: html
+
+       <table><colgroup><col width="50%"><col width="50%"></colgroup><tbody valign="top"><tr><td><h3>High-level Operations</h3>
+
+High-level cluster operations consist primarily of starting, stopping, and
+restarting a cluster with the ``ceph`` service;  checking the cluster's health;
+and, monitoring an operating cluster.
+
+.. toctree:: 
+       
+       operating
+       monitoring
+       troubleshooting
+       debug
+
+.. raw:: html 
+
+       </td><td><h3>Data Placement</h3>
+
+Once you have your cluster up and running, you may begin working with data
+placement. Ceph supports petabyte-scale data storage clusters, with storage
+pools and placement groups that distribute data across the cluster using Ceph's
+CRUSH algorithm.
+
+.. toctree::
+
+       data-placement
+       pools
+       placement-groups
+       crush-map
+
+
+
+.. raw:: html
+
+       </td></tr><tr><td><h3>Authentication</h3>
+
+Once you have data placement policies in place, you can begin creating users
+and assigning them capabilities, such as the ability to read and write data
+to one or more pools, or the cluster as a whole.  
+
+.. toctree:: 
+
+       authentication
+
+
+.. raw:: html
+
+       </td><td><h3>Daemon Operations</h3>
+
+Low-level cluster operations consist of starting, stopping, and restarting a
+particular daemon within a cluster; changing the settings of a particular
+daemon or subsystem; and, adding a daemon to the cluster or removing a  daemon
+from the cluster. The most common use cases for low-level operations include
+growing or shrinking the Ceph cluster and replacing legacy or failed hardware
+with new hardware.
+
+.. toctree:: 
+
+       add-or-rm-osds
+       add-or-rm-mons
+       Command Reference <control>
+
+
+.. raw:: html
+
+       </td></tr></tbody></table>
+