Update readme

README.md

@@ -19,6 +19,12 @@ cd my-app
 npm start
 ```
 
+Or simply use this command
+
+```
+npx create-react-app my-app && cd my-app && npm start
+```
+
 If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` or `yarn global remove create-react-app` to ensure that npx always uses the latest version.
 
 _([npx](https://medium.com/@maybekatz/introducing-npx-an-npm-package-runner-55f7d4bd282b) comes with npm 5.2+ and higher, see [instructions for older npm versions](https://gist.github.com/gaearon/4064d3c23a77c74a3614c498a8bb1c5f))_