Add command guide for openstack pool CLI

Change-Id: I5493e53cbc95ea17d9032c85c5bf6b16639f7a70
Co-Authored-By: wangxiyuan<wangxiyuan@huawei.com>

doc/source/command-line.rst

@@ -14,3 +14,4 @@ Click the Link below for the details.
 
    command/queue
    command/claim
+   command/pool

doc/source/command/pool.rst

@@ -0,0 +1,152 @@
+Pool
+====
+
+For help on a specific :command:`openstack pool` command, enter:
+
+.. code-block:: console
+
+   $ openstack pool COMMAND -h/--help
+
+The five commands:
+
+.. code-block:: console
+
+      pool create
+      pool delete
+      pool list
+      pool show
+      pool update
+
+.. _openstack_pool_create:
+
+openstack pool create
+---------------------
+
+.. code-block:: console
+
+   usage: openstack pool create [-h] [-f {json,shell,table,value,yaml}]
+                                [-c COLUMN] [--max-width <integer>] [--noindent]
+                                [--prefix PREFIX] [--pool_group <pool_group>]
+                                [--pool_options <pool_options>]
+                                <pool_name> <pool_uri> <pool_weight>
+
+Create a pool.
+
+**Positional arguments:**
+
+``<pool_name>``
+  Name of the pool.
+
+``<pool_uri>``
+  Storage engine URI.
+
+``<pool_weight>``
+  weight of the pool.
+
+**Optional arguments:**
+
+``--pool_group <pool_group>``
+  Group of the pool.
+
+``--pool_options <pool_options>``
+  An optional request component related to
+  storage-specific options.
+
+.. _openstack_pool_delete:
+
+openstack pool delete
+---------------------
+
+.. code-block:: console
+
+   usage: openstack pool delete [-h] <pool_name>
+
+Delete a pool.
+
+**Positional arguments:**
+
+``<pool_name>``
+  Name of the pool.
+
+
+.. _openstack_pool_list:
+
+openstack pool list
+-------------------
+
+.. code-block:: console
+
+   usage: openstack pool list [-h] [-f {csv,json,table,value,yaml}] [-c COLUMN]
+                              [--max-width <integer>] [--noindent]
+                              [--quote {all,minimal,none,nonnumeric}]
+                              [--marker <pool_name>] [--limit <limit>]
+                              [--detailed <detailed>]
+
+List available Pools.
+
+**Optional arguments:**
+
+``--marker <pool_name>``
+  Pool's paging marker.
+
+``--limit <limit>``
+  Page size limit.
+
+``--detailed <detailed>``
+  Detailed output.
+
+.. _openstack_pool_show:
+
+openstack pool show
+-------------------
+
+.. code-block:: console
+
+   usage: openstack pool show [-h] [-f {json,shell,table,value,yaml}] [-c COLUMN]
+                           [--max-width <integer>] [--noindent]
+                           [--prefix PREFIX]
+                           <pool_name>
+
+Display pool details.
+
+**Positional arguments:**
+
+``<pool_name>``
+  Pool to display (name).
+
+.. _openstack_pool_update:
+
+openstack pool update
+---------------------
+
+.. code-block:: console
+
+   usage: openstack pool update [-h] [-f {json,shell,table,value,yaml}]
+                                [-c COLUMN] [--max-width <integer>] [--noindent]
+                                [--prefix PREFIX] [--pool_uri <pool_uri>]
+                                [--pool_weight <pool_weight>]
+                                [--pool_group <pool_group>]
+                                [--pool_options <pool_options>]
+                                <pool_name>
+
+Update a pool attribute.
+
+**Positional arguments:**
+
+``<pool_name>``
+  Name of the pool.
+
+**Optional arguments:**
+
+``--pool_uri <pool_uri>``
+  Storage engine URI.
+
+``--pool_weight <pool_weight>``
+  Weight of the pool.
+
+``--pool_group <pool_group>``
+  Group of the pool.
+
+``--pool_options <pool_options>``
+  An optional request component related to
+  storage-specific options.