Add README

Signed-off-by: Rouven Czerwinski <[email protected]>

Author: Emantor

README.rst

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+Welcome to labgridhelper
+========================
+
+|license| |chat|
+
+Purpose
+-------
+The labgridhelper library collects labgrid helper functions for labgrid tests.
+Testsuites can often share functionality, such as the retrieval of systemd
+service status information or the retrieval of ip addresses.
+
+.. |license| image:: https://img.shields.io/badge/license-LGPLv2.1-blue.svg
+    :alt: LGPLv2.1
+    :target: https://raw.githubusercontent.com/labgrid-project/labgrid/master/LICENSE
+
+.. |chat| image:: https://matrix.to/img/matrix-badge.svg
+    :alt: chat
+    :target: https://riot.im/app/#/room/#labgrid:matrix.org