update RN plugin example

Author: Cesar Sosa

README.md

@@ -40,10 +40,18 @@ In addition to this README, the following is available in the [React Native plug
 * In-App Payments SDK cannot issue refunds. Refunds can be issued programmatically using
   the Refunds API or manually in the [Square Dashboard].
 
+
 ## Sample applications
-* **[Quick start React Native app]:** You can learn how the In-App-Payments React Native plugin is used by [getting started with the example app], a quick-start React Native app that lets you take a payment after completing 6 setup steps. 
-* **Quick start backend app:** The [In-App Payments Server Quickstart](https://github.com/square/in-app-payments-server-quickstart) 
-takes the nonce created by the React Native app and uses it to create a payment credited to your Square account. Use this backend sample to quickly create a complete payment flow.
+
+### Steps
+
+1. Run yarn 
+2. Run yarn prepare
+3. cd example-expo
+4. Run yarn 
+6. Run npx expo prebuild
+7. Run yarn ios
+
 
 ## License