Update place_tracker README (#530)

place_tracker/README.md

@@ -1,11 +1,10 @@
 # Place Tracker
 
-A sample place tracking app that uses the [google_maps_flutter](https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter) plugin. 
-Keep track of your favorite places, places you've visited, and places you want to go. View details
-about these places, show them on a map, and get directions to them.
-
-**This sample is not currently in a finished state. We're in the process
-of building it out. This sample currently only works on Android (see Caveat below).**
+A sample place tracking app that uses the
+[google_maps_flutter](https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter)
+plugin. Keep track of your favorite places, places you've visited, and places
+you want to go. View details about these places, show them on a map, and get
+directions to them.
 
 ## Goals
 
@@ -34,6 +33,7 @@ To run this sample app, you will need an API key.
 
 Get an API key at <https://cloud.google.com/maps-platform/>.
 
+### Android
 Specify your API key in the application manifest
 `android/app/src/main/AndroidManifest.xml`:
 
@@ -44,6 +44,23 @@ Specify your API key in the application manifest
                android:value="YOUR KEY HERE"/>
 ```
 
+### iOS
+Specify your API key in `AppDelegate.swift`:
+
+```swift
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GMSServices.provideAPIKey("YOUR API KEY HERE")
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}
+```
+
 For additional help setting up the plugin, see the plugin's
 [README](https://pub.dev/packages/google_maps_flutter)
 page.
@@ -55,13 +72,6 @@ For help getting started with Flutter, view our online
 
 The google_maps_flutter plugin is in developer preview until [dynamic thread
 merging](https://github.com/flutter/flutter/projects/155) is finished.
-* Dart APIs for controlling and interacting with a GoogleMap view from Flutter
-  code are still being consolidated and expanded. The intention is to grow
-  current coverage into a complete offering. Issues and pull requests aimed to
-  help us prioritize and speed up this effort are very welcome.
-* Currently the plugin only supports Android as it embeds a platform view in the
-  Flutter hierarchy which is currently only supported for Android ([tracking
-  issue](https://github.com/flutter/flutter/issues/19030)).
 
 ## Questions/issues