A description of this package.
https://www.swift.org/getting-started/#using-the-package-manager
https://www.swift.org/package-manager/
https://github.com/apple/swift-package-manager
https://developer.apple.com/documentation/xcode/creating-a-standalone-swift-package-with-xcode
https://sketchk.xyz/2020/12/26/Write-a-Swift-CLI