docs: add workshop link

Author: Kent C. Dodds

README.md

@@ -635,6 +635,7 @@ Some included are:
 
 * [Confident React](https://www.youtube.com/watch?v=qXRPHRgcXJ0&list=PLV5CVI1eNcJgNqzNwcs4UKrlJdhfDjshf)
 * [Test Driven Development with react-testing-library](https://www.youtube.com/watch?v=kCR3JAR7CHE&list=PLV5CVI1eNcJgCrPH_e6d57KRUTiDZgs0u)
+* [Testing React and Web Applications](https://kentcdodds.com/workshops/#testing-react-and-web-applications)
 * [Build a joke app with TDD](https://medium.com/@mbaranovski/quick-guide-to-tdd-in-react-81888be67c64) by [@mbaranovski](https://github.com/mbaranovski)
 * [Build a comment feed with TDD](https://medium.freecodecamp.org/how-to-build-sturdy-react-apps-with-tdd-and-the-react-testing-library-47ad3c5c8e47) by [@iwilsonq](https://github.com/iwilsonq)