Add GitHub Actions status badge

Author: wimpyprogrammer

README.md

@@ -3,6 +3,7 @@
 [![npm package](https://badge.fury.io/js/strings-to-regex.svg)](https://badge.fury.io/js/strings-to-regex)
 ![node version](https://img.shields.io/node/v/strings-to-regex.svg)
 ![npm type definitions](https://img.shields.io/npm/types/strings-to-regex)
+![Tests status](https://github.com/wimpyprogrammer/strings-to-regex/workflows/Tests/badge.svg)
 [![codecov](https://codecov.io/gh/wimpyprogrammer/strings-to-regex/branch/main/graph/badge.svg)](https://codecov.io/gh/wimpyprogrammer/strings-to-regex)
 [![Known Vulnerabilities](https://snyk.io/test/github/wimpyprogrammer/strings-to-regex/badge.svg)](https://snyk.io/test/github/wimpyprogrammer/strings-to-regex)