In Xcode 13 beta 1, they've moved how you access 3rd party Swift Packages: File menu -> Add Packages...

However, when I attempt to "+" to add a collection, and enter https://github.com/twostraws/CodeScanner into the dialog box, I get the following error:

The operation couldn't be completed. (PackageCollections.JSONPackageCollectionProviderError error 3.)

OK, so I downloaded the git repository, and attempted to "Add Local..." - but after I select the folder containing the package I am returned to the Project -> Swift Packages tab with NO new packages added.

I'm guessing this is a Xcode beta 1 issue - but it does appear as if the tutorial will need to be updated to reflect Apple's new way of accessing Packages.

I have added it with no problem

1. File Menu > Add Packages…
2. Then in the "Search or Enter Package URL" add https://github.com/twostraws/CodeScanner
3. Then Add Package
4. Then click the package product and Add Package

Its a good idea to do a Build (cmd+B) then should be able to import CodeScanner and then use it.

Did this on Xcode 13 beta 1

Download the file, add by yourself.