Official document: https://docs.flutter.dev/development/add-to-app/ios/project-setup#option-a---embed-with-cocoapods-and-the-flutter-sdk
Complete official sample code: https://github.com/flutter/samples/tree/main/add_to_app/books
1. From the terminal, go to your current iOS native project, for eg: /Users/.../reproduce_issue_ios_native_addtoapp_optionA/
2. Group all current files/directories into a new directory (named MyApp
for eg)