Add OpenSSF Scorecard badge to README

Author: wlemkows

README.md

@@ -5,6 +5,7 @@
 [![Bandit](https://github.com/oneapi-src/unified-runtime/actions/workflows/bandit.yml/badge.svg)](https://github.com/oneapi-src/unified-runtime/actions/workflows/bandit.yml)
 [![Coverity](https://scan.coverity.com/projects/28213/badge.svg)](https://scan.coverity.com/projects/oneapi-src-unified-runtime)
 [![codecov.io](https://codecov.io/github/oneapi-src/unified-runtime/coverage.svg?branch=main)](https://codecov.io/github/oneapi-src/unified-runtime?branch=master)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/oneapi-src/unified-runtime/badge)](https://securityscorecards.dev/viewer/?uri=github.com/oneapi-src/unified-runtime)
 
 <!-- TODO: add general description and purpose of the project -->