iOS: Write a default .gitignore file for the "Generated" directory
iOS: Write a default .gitignore file for the "Generated" directory

turnidge/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,Hixie/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,aghassemi/flutter,turnidge/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,flutter/flutter,cbracken/flutter,cbracken/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,aghassemi/flutter,Hixie/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,aghassemi/flutter,cbracken/flutter,turnidge/flutter,flutter/flutter,Hixie/flutter,aghassemi/flutter,turnidge/flutter,cbracken/flutter,turnidge/flutter