Reorganize files in example app project

Example/Example.xcodeproj/project.pbxproj

Example/ExampleApp (iOS)/App.swift

... (iOS)/Assets.xcassets/AccentColor.colorset/Contents.json

...pp (iOS)/Assets.xcassets/AppIcon.appiconset/Contents.json

...s.xcassets/AppIcon.appiconset/iOS App Store 1024pt 1x.png

...)/Assets.xcassets/AppIcon.appiconset/iPad App 76pt 1x.png

...)/Assets.xcassets/AppIcon.appiconset/iPad App 76pt 2x.png

...xcassets/AppIcon.appiconset/iPad Notification 20pt 1x.png

...xcassets/AppIcon.appiconset/iPad Notification 20pt 2x.png

...AppIcon.appiconset/iPad Pro (12.9-inch) App 83.5pt 2x.png

...ets.xcassets/AppIcon.appiconset/iPad Settings 29pt 1x.png

...ets.xcassets/AppIcon.appiconset/iPad Settings 29pt 2x.png

...ts.xcassets/AppIcon.appiconset/iPad Spotlight 40pt 1x.png

...ts.xcassets/AppIcon.appiconset/iPad Spotlight 40pt 2x.png

...Assets.xcassets/AppIcon.appiconset/iPhone App 60pt 2x.png

...Assets.xcassets/AppIcon.appiconset/iPhone App 60pt 3x.png

...assets/AppIcon.appiconset/iPhone Notification 20pt 2x.png

...assets/AppIcon.appiconset/iPhone Notification 20pt 3x.png

...s.xcassets/AppIcon.appiconset/iPhone Settings 29pt 2x.png

...s.xcassets/AppIcon.appiconset/iPhone Settings 29pt 3x.png