Add client code for new backend

https://gitlab.ub.uni-bielefeld.de/cmg/clowm/clowm-backend

added enhancement label

assigned to @daniel.goebel

created branch feature/116-add-client-code-for-new-backend to address this issue

mentioned in merge request !113 (merged)

mentioned in commit 0e2f79b6

mentioned in commit b7796025

mentioned in commit 24df669c

closed with merge request !113 (merged)