Added Scratch book. Added authors to a couple existing Scratch books (#9044)

* Added Scratch book.  Added authors to a couple existing Scratch books

* Added Scratch book.  Added authors to a couple existing Scratch books.  Fixed missing PDF indicators.

* Update books/free-programming-books-langs.md

Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>

Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>
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Brian L. McQueen 2022-10-30 13:14:49 -04:00 committed by GitHub
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@ -2308,10 +2308,11 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
### Scratch
* [An Introductory Computing Curriculum Using Scratch](http://scratched.gse.harvard.edu/guide/download.html)
* [Computer Science Concepts in Scratch](https://stwww1.weizmann.ac.il/scratch/scratch_en/)
* [An Introductory Computing Curriculum Using Scratch](http://scratched.gse.harvard.edu/guide/download.html) (HTML)
* [Code Club Book of Scratch](https://magpi.raspberrypi.com/books/book-of-scratch) - Rik Cross, Tracy Gardner (PDF)
* [Computer Science Concepts in Scratch](https://stwww1.weizmann.ac.il/scratch/scratch_en/) - Michal Armoni, Moti Ben-Ari (PDF)
* [Learn to Code with Scratch](https://magpi.raspberrypi.com/books/essentials-scratch-v1) - The MagPi magazine (PDF)
* [Scratch Programming Playground](https://inventwithscratch.com/book/) - Al Sweigart
* [Scratch Programming Playground](https://inventwithscratch.com/book/) - Al Sweigart (HTML)
### Sed