Update Readme with authors and license

README.md

 Redeleitsystem
 ==============
 
-System to handle the order of speakers during a discussion.
+System to handle the order of speakers during a discussion, which is published 
+under GPLv3 or later.
+
+This repository contains files from other projects which may have another license.
+These are explicitly stated at the beginning of each file.
+
+Authors 
+-------
+- Lars Beckers <larsb@fsmpi.rwth-aachen.de>
+- Robin Sonnanbend <robin@fsmpi.rwth-aachen.de>
+- Hinrikus Wolf <hinrikus@fsmpi.rwth-aachen.de>
+
+If you want to contribute to Redeleitsystem drop us an email, please.
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