There is an updated howto here: swift-package-manager/Usage.md at 263171977ebcd47f4aaca1202cff5a96c5158a64 · apple/swift-package-manager · GitHub
There is an updated howto here: swift-package-manager/Usage.md at 263171977ebcd47f4aaca1202cff5a96c5158a64 · apple/swift-package-manager · GitHub