Library content!

What's Changed

• Add Library Content Provider by @wzso in #8
  • More info: https://developer.apple.com/documentation/swiftui/xcode-library-customization
• Fix Swift 5.8 compilation and usage errors (7a3626d)

New Contributors

• @wzso made their first contribution in #8

Full Changelog: 2.0.1...2.1.0