Add swift version of Platform Channel example (#9098)
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+# Example of calling platform services from Flutter
+
+This project demonstrates how to connect a Flutter app to platform
+specific services on iOS using Swift. The equivalent version of this
+project in Objective C is found in examples/platform_channel.
+
+You can read more about
+[accessing platform and third-party services in Flutter](https://flutter.io/platform-channels/).
+
+## iOS
+You can use the commands `flutter build` and `flutter run` from the app's root
+directory to build/run the app or you can open `ios/Runner.xcworkspace` in Xcode
+and build/run the project as usual.
+
+## Android
+We refer to the platform_channel project.
