Update README with CodeQL badge

Author: marcos-iov

README.md

@@ -3,6 +3,7 @@
 [![Build and test](https://github.com/rsksmart/powpeg-node/actions/workflows/build_and_test.yml/badge.svg)](https://github.com/rsksmart/powpeg-node/actions/workflows/build_and_test.yml)
 [![Rootstock Integration Tests](https://github.com/rsksmart/powpeg-node/actions/workflows/rit.yml/badge.svg)](https://github.com/rsksmart/powpeg-node/actions/workflows/rit.yml)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=rsksmart_powpeg-node&metric=alert_status)](https://sonarcloud.io/dashboard?id=rsksmart_powpeg-node)
+[![CodeQL](https://github.com/rsksmart/powpeg-node/workflows/CodeQL/badge.svg)](https://github.com/rsksmart/powpeg-node/actions?query=workflow%3ACodeQL)
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/rsksmart/powpeg-node/badge)](https://scorecard.dev/viewer/?uri=github.com/rsksmart/powpeg-node)