chore: add scorecard badge

Author: sgammon

README.md

@@ -13,5 +13,6 @@
 [![Push](https://github.com/javamodules/javamodules.dev/actions/workflows/on.push.yml/badge.svg)](https://github.com/javamodules/javamodules.dev/actions/workflows/on.push.yml)
 [![OpenSSF Best Practices](https://www.bestpractices.dev/projects/8676/badge)](https://www.bestpractices.dev/projects/8676)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=javamodules_javamodules.dev&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=javamodules_javamodules.dev)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/javamodules/javamodules.dev/badge)](https://securityscorecards.dev/viewer/?uri=github.com/javamodules/javamodules.dev)
 
 This repository provides the web code for the [`javamodules.dev`](https://javamodules.dev) website and app. More coming soon.