comment creation - creator service

Create a service for the creator comment creation.

This is a child of #63 (closed)

changed the description

changed time estimate to 2h

changed the description

added ToDo label

assigned to @hdrs71

added WIP and removed ToDo labels

mentioned in merge request !44 (closed)

added ~1064 and removed WIP labels

added 2h of time spent at 2018-03-08

mentioned in merge request !46 (merged)

mentioned in merge request !47 (closed)

mentioned in merge request !54 (merged)

closed via merge request !54 (merged)

closed via commit dccede73

mentioned in commit dccede73