README: Added Stefan as contributor (issue #35)

README

-This is a layer to provide ROS in an openembedded linux system.
+This is a layer to provide ROS in an OpenEmbedded Linux system.
 Currently, this layer is still under development and not fully functional.
 
-AUTHOR
+MAINTAINER
   Lukas Bulwahn, BMW Car IT GmbH <lukas.bulwahn@oss.bmw-carit.de>
 
+CONTRIBUTORS
+  Lukas Bulwahn, BMW Car IT GmbH <lukas.bulwahn@oss.bmw-carit.de>
+  Stefan Herbrechtsmeier, Bielefeld University <stefan@herbrechtsmeier.net>
+
 HOW TO CONTRIBUTE
 
 We are still working on this development and are interested in other use cases.