Add swift version of Platform Channel example (#9098)

* wip

* wip

* delete main.m

* readd main.m

* update to use new channel api

* update android

* removed android/

* remove debug print

* remomved main.m

* Update year in copyright

* break long line and update name

* mit comments

* update examples/README

* break line

* update README

* update test
diff --git a/examples/platform_channel_swift/pubspec.yaml b/examples/platform_channel_swift/pubspec.yaml
new file mode 100644
index 0000000..100eccd
--- /dev/null
+++ b/examples/platform_channel_swift/pubspec.yaml
@@ -0,0 +1,14 @@
+name: platform_channel_swift
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_driver:
+    path: ../../packages/flutter_driver
+
+flutter:
+  uses-material-design: true