API-first with openapiprocessor and modelmapper

doc/adr-concept.md

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+## ADR-Concept
+
+This project uses ADRs (Architecture Decision Records), see also https://adr.github.io/.
+
+There is a template available under [0000-00-00.adr-tempate.md](./0000-00-00.adr-tempate.md).
+
+It's suggested to write an ADR if any of these is true:
+
+- an architectural decision is hard to change,
+- there is a dispute about an architectural decision,
+- some unusual architectural decision was made (e.g. unusual library),
+- some deeper investigation was necessary before the decision.
+
+ADRs should not be written for minor decisions with limited impact.
+