docs: add mc admin speedtest documentation

Co-authored-by: Ravind Kumar <ravindk89@gmail.com>

source/reference/minio-cli/minio-mc-admin.rst

@@ -90,6 +90,11 @@ The following table lists :mc-cmd:`mc admin` commands:
           :start-after: start-mc-admin-service-desc
           :end-before: end-mc-admin-service-desc
 
+   * - :mc:`mc admin speedtest`
+     - .. include:: /reference/minio-cli/minio-mc-admin/mc-admin-speedtest.rst
+          :start-after: start-mc-admin-speedtest-desc
+          :end-before: end-mc-admin-speedtest-desc
+
    * - :mc:`mc admin tier`
      - .. include:: /reference/minio-cli/minio-mc-admin/mc-admin-tier.rst
           :start-after: start-mc-admin-tier-desc

source/reference/minio-cli/minio-mc-admin/mc-admin-speedtest.rst

@@ -0,0 +1,68 @@
+======================
+``mc admin speedtest``
+======================
+
+.. default-domain:: minio
+
+.. contents:: Table of Contents
+   :local:
+   :depth: 2
+
+.. mc:: mc admin speedtest
+
+Description
+-----------
+
+.. start-mc-admin-speedtest-desc
+
+The :mc-cmd:`mc admin speedtest` command tests throughputs per host with ``PUT`` 
+and ``GET`` operations. 
+
+.. end-mc-admin-speedtest-desc
+
+:mc-cmd:`~mc admin speedtest` is available starting with ``mc``
+:mc-release:`RELEASE.2021-09-02T09-21-27Z` and supports distributed MinIO
+deployments running :minio-release:`RELEASE.2021-07-30T00-02-00Z` or later.
+
+:mc-cmd:`~mc admin speedtest` does not support standalone or MinIO Gateway
+deployments.
+
+.. admonition:: Use ``mc admin`` on MinIO Deployments Only
+   :class: note
+
+   .. include:: /includes/facts-mc-admin.rst
+      :start-after: start-minio-only
+      :end-before: end-minio-only
+
+Syntax
+------
+
+:mc-cmd:`mc admin speedtest` has the following syntax:
+
+.. code-block:: shell
+   :class: copyable
+
+   mc admin speedtest [FLAGS] TARGET
+
+:mc-cmd:`mc admin speedtest` supports the following arguments:
+
+.. mc-cmd:: TARGET
+
+   *Required*
+
+   The :mc-cmd:`alias <mc alias>` of a configured MinIO deployment to run the speedtest against.
+
+.. mc-cmd:: duration
+   :option:
+
+   The duration the entire speedtests are run. Defaults to ``10s``.
+
+.. mc-cmd:: size
+   :option:
+
+   The size of the objects used for uploads/downloads. Defaults to ``64MiB``.
+
+.. mc-cmd:: concurrent
+   :option:
+
+   The number of concurrent requests per server. Defaults to ``32``.