Add .clabot

.clabot

@@ -0,0 +1,4 @@
+{
+  "contributors": ["mhei", "jbysewski"],
+  "message": "We require contributors to sign our Contributor License Agreement. In order for us to review and merge your code, please fill https://forms.gle/5635zjphDo5JEJQSA to get yourself added."
+}