"AppIcon.appiconset" file can be generated by importing single image.
Main Features
1. Ability to generate "AppIcon.appiconset" for iOS applications.
2. Ability to generate "AppIcon.appiconset" for Mac applications.
3. Ability to generate "AppIcon.appiconset" for Apple Watch applications.
How does Xcode use the "AppIcon.appiconset" file?
1. Navigate to the Assets.xcassets Folder
2. Delete the pre existing AppIcon
3. Right click -> Import...-> choose the "AppIcon.appiconset" file.