fix: expo app doesn't have index.js (#686)

### Summary Generated expo example apps were missing the `index.js` file. Fixes #682 ### Test plan 1. Create a JS library 2. Run the example app and make sure it displays correctly
callstack · Nov 15, 2024 · f08ab08 · f08ab08
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diff --git a/packages/create-react-native-library/templates/expo-library/example/App.js b/packages/create-react-native-library/templates/expo-library/example/App.js
diff --git a/packages/create-react-native-library/templates/expo-library/example/index.js b/packages/create-react-native-library/templates/expo-library/example/index.js
@@ -0,0 +1,8 @@
+import { registerRootComponent } from 'expo';
+
+import App from './src/App';
+
+// registerRootComponent calls AppRegistry.registerComponent('main', () => App);
+// It also ensures that whether you load the app in Expo Go or in a native build,
+// the environment is set up appropriately
+registerRootComponent(App);