add cra v3 example

Author: bahmutov

README.md

@@ -235,6 +235,7 @@ For example, if you want to only include files in the `app` folder, but exclude
 - [bahmutov/cypress-and-jest](https://github.com/bahmutov/cypress-and-jest) shows how to run Jest unit tests and Cypress unit tests, collecting code coverage from both test runners, and then produce merged report.
 - [rootstrap/react-redux-base](https://github.com/rootstrap/react-redux-base) shows an example with a realistic Webpack config. Instruments the source code using `babel-plugin-istanbul` during tests.
 - [skylock/cypress-angular-coverage-example](https://github.com/skylock/cypress-angular-coverage-example) shows Angular 8 + TypeScript application with instrumentation done using [istanbul-instrumenter-loader](https://github.com/webpack-contrib/istanbul-instrumenter-loader).
+- [bahmutov/testing-react](https://github.com/bahmutov/testing-react) shows how to get code coverage for a React application created using [CRA v3](https://github.com/facebook/create-react-app) without ejecting `react-scripts`.
 
 ## Debugging