Merge pull request #3373 from mrmundt/url-status-badge

Add URL Status Badge to README

README.md

@@ -2,6 +2,7 @@
 [![Jenkins Status](https://github.com/Pyomo/jenkins-status/blob/main/pyomo_main.svg)](https://pyomo-jenkins.sandia.gov/)
 [![codecov](https://codecov.io/gh/Pyomo/pyomo/branch/main/graph/badge.svg)](https://codecov.io/gh/Pyomo/pyomo)
 [![Documentation Status](https://readthedocs.org/projects/pyomo/badge/?version=latest)](http://pyomo.readthedocs.org/en/latest/)
+[![URL Validation](https://img.shields.io/github/actions/workflow/status/Pyomo/pyomo/url_check.yml?branch=main&label=doc%20urls)](https://github.com/Pyomo/pyomo/actions/workflows/url_check.yml)
 [![Build services](https://github.com/Pyomo/jenkins-status/blob/main/pyomo_services.svg)](https://pyomo-jenkins.sandia.gov/)
 [![GitHub contributors](https://img.shields.io/github/contributors/pyomo/pyomo.svg)](https://github.com/pyomo/pyomo/graphs/contributors)
 [![Merged PRs](https://img.shields.io/github/issues-pr-closed-raw/pyomo/pyomo.svg?label=merged+PRs)](https://github.com/pyomo/pyomo/pulls?q=is:pr+is:merged)