doc: How to configure helm role

molgenis-jenkins/resources/README.md

@@ -0,0 +1,6 @@
+To be able to run helm inside a jenkins pod, you'll need to 
+* create a role in the namespace where tiller is installed
+* bind that role to the user that jenkins pods run as
+
+This directory contains yaml for these resources.
+See also https://github.com/helm/helm/blob/master/docs/rbac.md