Add main contributors

README.md

@@ -71,6 +71,16 @@ Please bring your laptop including a Web browser, a text editor, and a recent [G
 - [First Aid Git](http://firstaidgit.io)
 - [Interactive Git Cheat-Sheet](http://ndpsoftware.com/git-cheatsheet.html)
 
+## Contributors
+
+Here you find the main contributors to the material:
+
+- Tobias Schlauch
+- Carina Haupt
+- Michael Meinel
+- Martin Stoffers
+- Katrin Leinweber
+
 ## Contributing
 
 Please see [the contribution guidelines](CONTRIBUTING.md) for further information about how to contribute.