Add a CodeQL badge to the README

Author: mcdonnnj

README.md

@@ -1,6 +1,7 @@
 # skeleton-ansible-role #
 
 [![GitHub Build Status](https://github.com/cisagov/skeleton-ansible-role/workflows/build/badge.svg)](https://github.com/cisagov/skeleton-ansible-role/actions)
+[![CodeQL](https://github.com/cisagov/skeleton-ansible-role/workflows/CodeQL/badge.svg)](https://github.com/cisagov/skeleton-ansible-role/actions/workflows/codeql-analysis.yml)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/cisagov/skeleton-ansible-role.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/cisagov/skeleton-ansible-role/alerts/)
 [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/cisagov/skeleton-ansible-role.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/cisagov/skeleton-ansible-role/context:python)