docs: add OpenSSF Scorecard to README.md

Author: DNKpp

README.md

@@ -4,6 +4,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/DNKpp/mimicpp/badge.svg)](https://coveralls.io/github/DNKpp/mimicpp)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/b852271c6e8742fe8a1667e679dc422b)](https://app.codacy.com/gh/DNKpp/mimicpp/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
 [![Codacy Badge](https://app.codacy.com/project/badge/Coverage/b852271c6e8742fe8a1667e679dc422b)](https://app.codacy.com/gh/DNKpp/mimicpp/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_coverage)
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/DNKpp/mimicpp/badge)](https://scorecard.dev/viewer/?uri=github.com/DNKpp/mimicpp)
 [![Documentation](https://img.shields.io/badge/docs-doxygen-blue)](https://dnkpp.github.io/mimicpp/)
 
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