Merge branch 'make-test-coverage-207' into 'main'

docs: add "Contributor Covenant" badge

See merge request !36

README.md

 # AURA Steering: Program Scheduler
 
+[![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](code_of_conduct.md)
 [![latest release](https://gitlab.servus.at/aura/steering/-/badges/release.svg)](https://gitlab.servus.at/aura/steering/-/releases)
 [![pipeline status](https://gitlab.servus.at/aura/steering/badges/main/pipeline.svg)](https://gitlab.servus.at/aura/steering/-/commits/main)
 [![coverage report](https://gitlab.servus.at/aura/steering/badges/main/coverage.svg?job=run_test_cases)](https://gitlab.servus.at/aura/steering/-/commits/main)