Version 0.9.4, add GPLv3, change location of repo in docs.

Author: applio

CONTRIBUTING.MD

@@ -0,0 +1,10 @@
+# Contributor License Agreement
+
+In order for us to be able to accept your pull requests, you have to first fill out the [Contributor License Agreement (CLA)](https://www.knime.com/sites/default/files/KNIME_CLA.pdf). 
+
+Please fill out, date and sign the CLA and send the original signed copy via mail to us:
+
+	KNIME AG, Technoparkstrasse 1, 8005 Zurich, Switzerland
+
+Once we receive it, we will review your pull requests and can accept your contributions for all of our public repositories.
+