Add public beta link

Author: carson-katri

README.md

@@ -1,10 +1,12 @@
 <p align="center"><img src="Resources/banner.jpeg" /></p>
 <h2 align="center">A cross-platform Reddit client created in SwiftUI.</h2>
+<p align="center"><a href="https://testflight.apple.com/join/oiQDuLT7">Get the Public Beta</a></p>
 
 > *Note:* This project is far from complete. It still lacks many features of your typical Reddit client and has bugs (partly due to SwiftUI, but I'll take credit for some of them)
 
 To show off SwiftUI's strength in cross-platform development, I did **not** use Mac Catalyst for this project. Instead, common UI code is shared between iOS, macOS, and watchOS.
 
+
 ## Project Structure
 * `Shared` - Models, helpers, API, and any shared Views.
 * `Reddit-[PLATFORM]` - Each target folder contains a `Views` and `Representable` folder. `Views` holds platform-specific views, and `Representable` contains `UIViewRepresentables` or `NSViewRepresentables`.