added metadata badges

Author: ygit

README.md

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 # Awesome SwiftUI
 
+[![Platform](https://img.shields.io/badge/platform-iOS%20%7C%20macOS%20%7C%20watchOS%20%7C%20tvOS%20%7C%20UIKit%20For%20Mac-lightgrey.svg)](https://developer.apple.com/documentation/swiftui)
+[![Commits](https://img.shields.io/github/commit-activity/m/ygit/swiftui.svg)](https://github.com/ygit/swiftui/blob/master/README.md)
+[![PRs](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://github.com/ygit/swiftui/pulls)
+
+
 1. [SwiftUI on Apple Developer Documentation](https://developer.apple.com/tutorials/swiftui/) 
 
     📹 [Keynote WWDC 2019 - First announcement of SwiftUI](https://developer.apple.com/videos/play/wwdc2019/101/)