Add swiftui-messaging-ui

[muukii]

• Project Name: swiftui-messaging-ui
• Project URL: https://github.com/FluidGroup/swiftui-messaging-ui
• Project Description: Primitive SwiftUI chat UI component with stable prepending for loading older messages without scroll jumps.
• Why it should be added to awesome-swift: It helps SwiftUI apps build chat interfaces that can load older messages without visible scroll position jumps.
• At least 15 stars (GitHub project)
• Support Swift 5
• Updated contents.json instead of README
• Lib is fully open sourced, written in Swift and not a wrapper over compiled lib
• Description does not say "written in Swift" or variant 🤓

[matteocrippa]

thanks @muukii