Add "Holm School" - How to be a Computer Scientist for Hamiltons a Month (#5409)

* My book: Holm School - How to be a computer scientist for Hamiltons a Month (public domain)

* Update free-programming-books.md

books/free-programming-books.md

@@ -679,6 +679,7 @@
 * [Hacknot: Essays on Software Development](http://www.lulu.com/shop/ed-johnson/hacknot-essays-on-software-development/ebook/product-17544641.html) - Ed Johnson
 * [Hello SDL](https://lazyfoo.net/tutorials/SDL) - Lazy Foo' Productions
 * [High-Performance Scientific Computing](https://andreask.cs.illinois.edu/Teaching/HPCFall2012) (class lectures and slides)
+* [Holm School (You Might Learn Something) - How to Teach Yourself To Be A Computer Scientist for Hamiltons a Month](https://ryheimat.github.io/holm-school) - Ryhen Holm
 * [HoloLens Succinctly](https://www.syncfusion.com/ebooks/hololens_succinctly) - Lars Klint
 * [How Computers Work](http://www.fastchip.net/howcomputerswork/p1.html) - R. Young
 * [How to Become a Programmer](http://softwarebyrob.wpengine.netdna-cdn.com/assets/Software_by_Rob%20_How_to_Become_a%20_Programmer_1.0.pdf) (PDF)