Update README

Author: wmonk

README.md

@@ -7,20 +7,24 @@ Create React apps (with Typescript) with no build configuration.
 
 _Do you know react and want to try out typescript? Or do you know typescript and want to try out react?_ Get all the benefits from `create-react-app` but you use typescript! 🚀
 
-## tl;dr
+## Quick Overview
 
 ```sh
 npx create-react-app my-app --scripts-version=react-scripts-ts
-
-# or if you prefer:
-npm install -g create-react-app
-create-react-app my-app --scripts-version=react-scripts-ts
-
-# then:
-cd my-app/
+cd my-app
 npm start
+
+# or with yarn
+yarn create react-react-app my-app --scripts-version=react-scripts-ts
+cd my-app
+yarn start
 ```
 
+*([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))*
+
+Then open [http://localhost:3000/](http://localhost:3000/) to see your app.<br>
+When you’re ready to deploy to production, create a minified bundle with `npm run build`.
+
 ## Migration
 
 In general, most upgrades won't require any migration steps to work, but if you experience problems after an upgrade, please file an issue, and we'll add it to the list of migration steps below.