Document the CLI

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diff --git a/docs/cli.rst b/docs/cli.rst
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-Command line usage
-==================
+####################
+``gitlab`` CLI usage
+####################
 
-Document here how to use command line tool
+``python-gitlab`` provides a :command:`gitlab` command-line tool to interact
+with GitLab servers. It uses a configuration file to define how to connect to
+the servers.
+
+Configuration
+=============
+
+Files
+-----
+
+``gitlab`` looks up 2 configuration files by default:
+
+``/etc/python-gitlab.cfg``
+    System-wide configuration file
+
+``~/.python-gitlab.cfg``
+    User configuration file
+
+You can use a different configuration file with the :option:`--config-file`
+option.
+
+Content
+-------
+
+The configuration file uses the ``INI`` format. It contains at least a
+``[global]`` section, and a new section for each GitLab server. For example:
+
+.. code-block:: ini
+
+   [global]
+   default = somewhere
+   ssl_verify = true
+   timeout = 5
+
+   [somewhere]
+   url = https://some.whe.re
+   private_token = vTbFeqJYCY3sibBP7BZM
+
+   [elsewhere]
+   url = http://else.whe.re:8080
+   private_token = CkqsjqcQSFH5FQKDccu4
+   timeout = 1
+
+The ``default`` option of the ``[global]`` section defines the GitLab server to
+use if no server is explitly specified with the :option:`--gitlab` CLI option.
+
+The ``[global]`` section also defines the values for the default connexion
+parameters. You can override the values in each GitLab server section.
+
+.. list-table:: Global options
+   :header-rows: 1
+
+   * - Option
+     - Possible values
+     - Description
+   * - ``ssl_verify``
+     - ``True`` or ``False``
+     - Verify the SSL certificate. Set to ``False`` if your SSL certificate is
+       auto-signed.
+   * - ``timeout``
+     - Integer
+     - Number of seconds to wait for an answer before failing.
+
+You must define the ``url`` and ``private_token`` in each GitLab server
+section.
+
+.. list-table:: GitLab server options
+   :header-rows: 1
+
+   * - Option
+     - Description
+   * - ``url``
+     - URL for the GitLab server
+   * - ``private_token``
+     - Your user token. Login/password is not supported.
+
+CLI
+===
+
+Objects and actions
+-------------------
+
+The ``gitlab`` command expects two mandatory arguments. This first one is the
+type of object that you want to manipulate. The second is the action that you
+want to perform. For example:
+
+.. code-block:: console
+
+   $ gitlab project list
+
+Use the :option:`--help` option to list the available object types and actions:
+
+.. code-block:: console
+
+   $ gitlab --help
+   $ gitlab project --help
+
+Some actions require additional parameters. Use the :option:`--help` option to
+list mandatory and optional arguments for an action:
+
+.. code-block:: console
+
+   $ gitlab project create --help
+
+Optional arguments
+------------------
+
+Use the following optional arguments to change the behavior of ``gitlab``.
+These options must be defined before the mandatory arguments.
+
+``--verbose``, ``-v``
+    Outputs detail about retrieved objects.
+
+``--config-file``, ``-c``
+    Path to a configuration file.
+
+``--gitlab``, ``-g``
+    ID of a GitLab server defined in the configuration file.
+
+Example:
+
+.. code-block:: console
+
+   $ gitlab -v -g elsewhere -c /tmp/gl.cfg project list