Update readme (#5)

README.md

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-# swift-livestream
+# Livestream example app for Swift
+
+Multi-host live streaming app built with [LiveKit Swift Components](https://github.com/livekit/components-swift).
+
+## Features
+
+- Host and join live streams
+- Multiple hosts
+- Chat with other participants
+- Reactions
+- Runs on iOS and macOS
+- Clean, idomatic SwiftUI
+- Apache 2.0, Open Source
+
+It uses the same backend (to generate tokens, etc) provided by the [Next.js livestream example](https://github.com/livekit-examples/livestream) project.
+
+## Screenshots
+
+![screenshot1](https://livekit-docs.s3.amazonaws.com/github-assets/swift-livestream-1.png)
+![screenshot2](https://livekit-docs.s3.amazonaws.com/github-assets/swift-livestream-2.png)
+![screenshot3](https://livekit-docs.s3.amazonaws.com/github-assets/swift-livestream-3.png)