Ignore Xcode’s source control data.

This project has no dependent repositories.
Add licence (MIT).
Add basic readme.
Add empty asset catalogue.

Silences warning about missing iPhone 568 launch image.
Enable modules and remove framework references.
Remove precompiled header prefix.
Remove localised info plist.

Not needed for this demo.
Separate files into Source and Resources.
Change source file preamble to my preferred style.