Added Raspberry PI book list and two other books. (#4150)

* Added books and book lists.

* Moved meta-list to a section.

* Moved book from Smalltalk to Scratch.

* Added alphabetical order.

* Removed the list.

free-programming-books.md

@@ -587,6 +587,7 @@
 * [Barcode Overview](http://www.tec-it.com/download/PDF/Barcode_Reference_EN.pdf) (PDF)
 * [Bitcoin and Cryptocurrency Technologies](https://d28rh4a8wq0iu5.cloudfront.net/bitcointech/readings/princeton_bitcoin_book.pdf) -  Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder (PDF)
 * [Blockchain By Example](https://www.packtpub.com/free-ebooks/blockchain-example) - Bellaj Badr, Richard Horrocks, Xun (Brian) Wu (Packt account *required*)
+* [Coding With Minecraft](https://turtleappstore.com/book/) - Al Sweigart
 * [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](http://www.wisdom.weizmann.ac.il/~playbook/)
 * [Communicating Sequential Processes](http://www.usingcsp.com/cspbook.pdf) - Tony Hoare (PDF)
 * [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)
@@ -2598,6 +2599,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 * [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/)
+* [Scratch Programming Playground](https://inventwithscratch.com/book/) - Al Sweigart
 
 
 ### Sed