Add OpenSSF badges

Author: marcphilipp

SECURITY.md

@@ -1,5 +1,7 @@
 # Security Policy
 
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/9607/badge)](https://www.bestpractices.dev/projects/9607) [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/junit-team/junit5/badge)](https://scorecard.dev/viewer/?uri=github.com/{owner}/{repo})
+
 ## Supported Versions
 
 | Version | Supported          |