update README

Author: shirakaba

packages/jsi/README.md

@@ -30,8 +30,22 @@ cd packages/jsi/example
 # Generate the Xcode project (packages/jsi/example/ios):
 npx expo prebuild --platform ios --clean
 
+# Install CocoaPods for the iOS and macOS apps:
+cd ios && pod install && cd ..
+cd macos && pod install && cd ..
+
+# ==== iOS ====
 # Build and run the iOS example app.
 npm run ios
+# =============
+
+# === macOS ===
+# You will need two terminals for this.
+# Terminal 1: Start up the Metro bundler.
+npm run start
+# Terminal 2: Build and run the macOS app.
+npm run macos
+# =============
 ```
 
 ## License