Add starterkit example production

ADD PRODUCTION DESCRIPTION HERE!!!

This is a starterkit practice.

Instructions

Check our documentation for details of the submission process: https://lhcb-ap.docs.cern.ch/user_guide/submitting.html

If the samples created by your request will supersede older ones, please read the docs here for what you need to do: https://lhcb-ap.docs.cern.ch/user_guide/housekeeping.html#archiving-superseded-or-obsolete-outputs

If the merge request supersedes a previous one, add a comment at the end of the header: (supersedes !<MR number>).