Try now, it seems to have been uploaded!
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You can use the Swift Playgrounds Author Template for Xcode, which you can download from here:
https://developer.apple.com/download/more/?=Swift%20Playgrounds%20Author
You'd use this, on your Mac, to create a playground book that you can distribute and run on iPads in Swift Playgrounds.
There's also a session at this year's WWDC to tell you more (and maybe show off a new way to do it?):
https://developer.apple.com/wwdc20/10654
Post not yet marked as solved
You can use the Swift Playgrounds Author Template for Xcode, which you can download from here:
https://developer.apple.com/download/more/?=Swift%20Playgrounds%20Author
There's also a session at this year's WWDC to tell you more (and maybe show off a new way to do it?):
https://developer.apple.com/wwdc20/10654
I just ran an online class for kids where we took the Lights, Camera, Code playgrounds (after having gone through the Everyone Can Code Puzzles book -- https://books.apple.com/us/book/everyone-can-code-puzzles/id1481279769 -- with the kids) and used their infrastructure to build apps. They were getting ready to submit something for the Swift Student Challenge (but were a bit too young... you needed to be 16+ in Europe to submit.).
It's a great starting point once you've done the Learn to Code playgrounds!
Apple has a really great curriculum on the Book Store called App Development with Swift: https://books.apple.com/book/app-development-with-swift/id1465002990
I highly recommend it... it's a great way to learn the fundamentals and build some projects along the way.
