[DOCS] Add documentation part for command controller

Related: #1120

Documentation/CommandController.rst

@@ -0,0 +1,28 @@
+.. include:: /Includes.rst.txt
+
+.. _command-controller:
+
+==================
+Command Controller
+==================
+
+The "tea" extension comes with a CommandController that can be used for the
+automatic creation of test data. It also serves to illustrate how data can be
+created in the database using a command controller.
+
+You must set a page id as argument. Therefore it's necessary to create an
+sysfolder before.
+
+You can add option `-d` to delete already existing data.
+
+
+.. code-block:: bash
+
+   vendor/bin/typo3 tea:createtestdata 3
+
+
+.. seealso::
+
+   For further details to Console Commands read the
+   :ref:`Creating a basic command <t3coreapi:console-command-tutorial-create>`
+   tutorial.

Documentation/Index.rst

@@ -47,6 +47,7 @@ continuous integration.
    TestingFramework
    Environment
    DependencyManager
+   CommandController
    Running
    ContinuousIntegration
    Documentation