readme: update sections

This adds actual content to the readme file.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>

README.rst

@@ -5,16 +5,63 @@ Welcome to labgrid
 
 Purpose
 -------
+Labgrid is a embedded board control library which also supports remote exports
+and management of embedded boards.
+
+It currently supports:
+
+- pytest-plugin to write tests for embedded systems connecting over SSH or Serial
+- remote client-exporter-coordinator infrastructure to make boards available
+  from different computers on a network
+- Power/Reset management via plugins for power switches or onewire PIOs
+- Upload of images via imxusbloader/mxusbloader or fastboot
+- Functions to control external services such as emulated USB-Sticks and the
+  `Hawkbit <https://github.com/eclipse/hawkbit>`_ deployment service
 
 Documentation
 -------------
+`Read the docs <http://labgrid.readthedocs.io/en/latest/>`_
 
 Contributing
 ------------
+`Development Docs <http://labgrid.readthedocs.io/en/latest/development.html>`_
+
 
 Quickstart
 ----------
 
+Clone the git repository:
+
+.. code-block:: bash
+
+   git clone https://github.com/labgrid-project/labgrid
+
+Create and activate a virtualenv for labgrid:
+
+.. code-block:: bash
+
+   virtualenv -p python3 venv
+   source venv/bin/activate
+
+
+Install required dependencies:
+
+.. code-block:: bash
+
+   sudo apt install libow-dev
+
+Install labgrid into the virtualenv:
+
+.. code-block:: bash
+
+   python setup.py install
+
+Tests can now run via:
+
+.. code-block:: bash
+
+   python -m pytest --env-config=<config>
+
 
 .. |license| image:: https://img.shields.io/badge/license-LGPLv2.1-blue.svg
     :alt: LGPLv2.1