Update roadmap (#8829)

Author: paulb777

ROADMAP.md

@@ -11,6 +11,47 @@ contributing to the Firebase iOS SDK.
 
 ## Modernization - More Swifty
 
+As we go into 2022, it's a top priority for the Firebase team to improve
+usability and functionality for Swift developers. We welcome the community's
+input and contribution as we work through this.
+
+Please upvote existing feature requests, add new feature requests, and send PRs.
+* [Example Feature Request](https://github.com/firebase/firebase-ios-sdk/issues/8827)
+* [Example Pull Request](https://github.com/firebase/firebase-ios-sdk/pull/6568)
+
+See [Contributing.md](Contributing.md) for full details about contributing
+code to the Firebase repo.
+
+Thanks in large part to community contributions, we already have several Swift
+improvements:
+* Analytics
+  * Enabling [SwiftUI Screen tracking](https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseAnalyticsSwift/CHANGELOG.md)
+   automated view logging for SwiftUI apps
+* Firestore and RTDB
+  * Codable Support ([Firestore](https://github.com/firebase/firebase-ios-sdk/pull/3198),
+   [Database](https://github.com/firebase/firebase-ios-sdk/tree/master/FirebaseDatabaseSwift/Sources/Codable))
+   eliminated manual data processing
+  * [Property wrappers](https://github.com/firebase/firebase-ios-sdk/pull/8408) for Firestore collections dramatically simplified client coding
+* Storage
+  * Eliminated impossible states, provided new and improved async API usage via
+   [Result type](https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseStorageSwift/CHANGELOG.md)
+   and [async/await](https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseStorageSwift/CHANGELOG.md)
+   additions
+* ML Model Downloader
+  * Full [SDK implementation in Swift](https://github.com/firebase/firebase-ios-sdk/tree/master/FirebaseMLModelDownloader/Sources)
+* In App Messaging
+  * Vastly simplified usage from SwiftUI with
+   [SwiftUI modifiers](https://github.com/firebase/firebase-ios-sdk/pull/7496) to show messages and
+   [preview helpers](https://github.com/firebase/firebase-ios-sdk/pull/8351)
+
+### Phase 1 - Address Low Hanging Fruit for all Firebase Products
+* Swift API tests
+* async/await API evaluation, tests, and augmentation
+* Fix non-Swifty APIs
+* Fill API gaps
+* Property Wrappers (Not necessarily low hanging, but can be high value)
+* Identify larger projects for future phases
+
 ### APIs
 
 Continue to evolve the Firebase API surface to be more
@@ -23,14 +64,8 @@ Codable support for Firestore.
 
 Add more such APIs to improve the Firebase Swift API.
 
-More details in the
-[project](https://github.com/firebase/firebase-ios-sdk/projects/2).
-
-### Combine
-
-Add combine support for Firebase. See the
-[Tracking Issue](https://github.com/firebase/firebase-ios-sdk/issues/7295) and
-[Project](https://github.com/firebase/firebase-ios-sdk/projects/3).
+More examples in the
+[feature requests](https://github.com/firebase/firebase-ios-sdk/issues?q=is%3Aopen+is%3Aissue+label%3A%22Swift+API%22).
 
 ### SwiftUI
 
@@ -40,7 +75,16 @@ Firebase should be better integrated with SwiftUI apps. See SwiftUI related
 ### Swift Async/Await
 
 Evaluate impact on Firebase APIs of the
-[Swift Async/await proposal](https://github.com/apple/swift-evolution/blob/main/proposals/0296-async-await.md)
+[Swift Async/await proposal](https://github.com/apple/swift-evolution/blob/main/proposals/0296-async-await.md).
+For example, Objective C callback APIs that return a value do not get an
+async/await API automatically generated and an explicit function may need to be
+added. See these
+[Firebase Storage examples](https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseStorageSwift/Sources/AsyncAwait.swift).
+
+### Combine
+
+Firebase has community support for Combine (Thanks!). See
+[Combine Readme](FirebaseCombineSwift/README.md) for usage and project details.
 
 ## More complete Apple platform support
 
@@ -59,12 +103,16 @@ primarily *watchOS* for several libraries.
 ### Quickstarts
 
 Modernize the [Swift Quickstarts](https://github.com/firebase/quickstart-ios).
-Continue the work done in 2020 for
+Continue the work done in 2020 and 2021 that used better Swift style, SwiftUI,
+Swift Package Manager, async/await APIs, and multi-platform support for
 [Analytics](https://github.com/firebase/quickstart-ios/tree/master/analytics),
+[ABTesting](https://github.com/firebase/quickstart-ios/tree/master/abtesting),
 [Auth](https://github.com/firebase/quickstart-ios/tree/master/authentication),
+[Database](https://github.com/firebase/quickstart-ios/tree/master/database),
+[Functions](https://github.com/firebase/quickstart-ios/tree/master/functions),
+[Performance](https://github.com/firebase/quickstart-ios/tree/master/performance),
 and
-[RemoteConfig](https://github.com/firebase/quickstart-ios/tree/master/config) to
-use modern Swift and support multiple Apple platforms.
+[RemoteConfig](https://github.com/firebase/quickstart-ios/tree/master/config).
 
 ## Product Improvements