Add sonar tags

readme.md

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+[![CI](https://github.com/europeana/mets-processing-engine/actions/workflows/ci.yml/badge.svg)](https://github.com/europeana/mets-processing-engine/actions/workflows/ci.yml) [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=europeana_mets-processing-engine&metric=coverage)](https://sonarcloud.io/summary/new_code?id=europeana_mets-processing-engine)
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 Info about running the POC on the openshift cluster:
 
 1. Prepare config directory: