Modernize Swift codelab

.gitignore

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+.agents/
 .idea/
 gen/
 .DS_Store

README.md

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-# Firebase Codelab: FriendlyChat
+# Firebase Codelab: FriendlyChat iOS
 
-This is the source code for the Firebase FriendlyChat codelab. It includes start and end versions of the
-code for Objective-C and Swift. To get started open the codelab instructions:
+This is the source code for the Firebase FriendlyChat codelab for iOS. It includes starter and completed versions of the app in Swift and Objective-C.
 
- - [Firebase Swift Codelab](https://codelabs.developers.google.com/codelabs/firebase-ios-swift/).
- - [Firebase Objective-C Codelab](https://codelabs.developers.google.com/codelabs/firebase-ios-objc/).
+## Codelab Tutorial
+- [Firebase Swift Codelab](https://codelabs.developers.google.com/codelabs/firebase-ios-swift/) — Modern Swift using SwiftUI, Swift Package Manager, Swift Concurrency, and Firebase iOS SDK v12+.
+- [Firebase Objective-C Codelab](https://codelabs.developers.google.com/codelabs/firebase-ios-objc/)
 
+### Projects Included
+- `ios-starter/swift-starter`: The starter SwiftUI project you will build upon in the Swift Codelab (using Xcode and Swift Package Manager).
+- `ios/swift`: The finished SwiftUI app with complete implementation of Firebase Authentication, Cloud Firestore, and Cloud Storage.
+- `ios-starter/objc-starter` & `ios/objc`: Legacy Objective-C starter and completed projects.
 
 ## How to make contributions?
-Please read and follow the steps in the [CONTRIBUTING.md](CONTRIBUTING.md)
-
+Please read and follow the steps in [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ## License
 See [LICENSE](LICENSE)