[DOC]Add server groups manage docs

Change-Id: I9d78b02d87600e553d656127b8110fe8a93d57b7

doc/source/index.rst

@@ -59,6 +59,7 @@ User Guide
 
   user/states
   user/root-disk-partitions
+  user/server-groups
 
 
 Administrator Guide

doc/source/user/root-disk-partitions.rst

@@ -11,3 +11,15 @@ the root partition until the end of the disk.
 .. note:: Whole disk images, on the contrary, not support partitions, passing
           partitions to server creation results in a fault and will prevent the
           creation from happening.
+
+#. To create server with partitions, use ``--partition`` parameter on the
+:command:`openstack baremetalcompute server create` command.
+
+   For example:
+
+   .. code-block:: console
+
+      $ openstack baremetalcompute server create --image IMAGE --flavor gold \
+        --key-name KEY --availability-zone ZONE --partition root_gb=100 \
+        --partition ephemeral_gb=200 --partition swap_mb=40960 \
+        --nic net-id=UUID SERVER

doc/source/user/server-groups.rst

@@ -0,0 +1,61 @@
+Server Groups
+=============
+
+It's quite like Nova server groups for VMs, but we are based on affinity_zone
+which is a special metadata of aggregate. affinity and anti-affinity policies
+make sure servers are on the same or different affinity zones.
+
+Create a Server Group
+---------------------
+
+#. If you want all servers to run on the same affinity zone, create a group with
+`affinity` policy.
+
+   For example:
+
+   .. code-block:: console
+
+      $ openstack baremetalcompute server group create --policy affinity Affi
+      +------------+--------------------------------------+
+      | Field      | Value                                |
+      +------------+--------------------------------------+
+      | uuid       | 5ffe7cc8-c793-4568-be3f-654bc9231acd |
+      | name       | Affi                                 |
+      | user_id    | d4479638a8594d359d7f6115980b08da     |
+      | project_id | 378d5add81b44d3e9afc5b99c31ad209     |
+      | members    |                                      |
+      | policies   | affinity                             |
+      +------------+--------------------------------------+
+
+#. If you want all servers to run on different affinity zone, create a group with
+`anti-affinity` policy.
+
+   For example:
+
+   .. code-block:: console
+
+      $ openstack baremetalcompute server group create --policy anti-affinity Anti
+      +------------+--------------------------------------+
+      | Field      | Value                                |
+      +------------+--------------------------------------+
+      | uuid       | 719d7cf9-141f-4c73-b5e8-669f6b4d4b89 |
+      | name       | Anti                                 |
+      | user_id    | d4479638a8594d359d7f6115980b08da     |
+      | project_id | 378d5add81b44d3e9afc5b99c31ad209     |
+      | members    |                                      |
+      | policies   | anti-affinity                        |
+      +------------+--------------------------------------+
+
+Add a server to Server Group
+----------------------------
+
+You can only add a server to a server group when you create the server. Not afterwards.
+To add a server to a server group, use the ``--hint group=$group-uuid`` parameter on
+the :command:`openstack baremetalcompute server create` command.
+
+   For example:
+
+   .. code-block:: console
+
+      $ openstack baremetalcompute server create --image IMAGE --flavor gold \
+        --key-name KEY --hint group=GROUP --nic net-id=UUID SERVER