Add openssf scorecard badge to readme

Co-authored-by: Yannik Rudolph <[email protected]>

README.md

@@ -9,6 +9,7 @@ Collection of independent libraries on top of Spring Boot to provide a faster se
 [![Build](https://github.com/otto-de/edison-microservice/workflows/Build/badge.svg?branch=master)](https://github.com/otto-de/edison-microservice/actions?query=workflow%3ABuild)
 [![codecov](https://codecov.io/gh/otto-de/edison-microservice/branch/master/graph/badge.svg)](https://codecov.io/gh/otto-de/edison-microservice)
 [![Known Vulnerabilities](https://snyk.io/test/github/otto-de/edison-microservice/badge.svg)](https://snyk.io/test/github/otto-de/edison-microservice)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/otto-de/edison-microservice/badge)](https://securityscorecards.dev/viewer/?uri=github.com/otto-de/edison-microservice)
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 [![license](https://img.shields.io/github/license/otto-de/edison-microservice.svg)](./LICENSE)