Updated design pattern book by Saturngod to free-programming-books-my.md (#9951)

* Updated design pattern book by Saturngod to free-programming-books-my.md

* remove triling slash

* Added java book category and resource to free-programming-books-my.md

Author: LaPyaeOo

books/free-programming-books-my.md

@@ -3,6 +3,7 @@
 * [Blockchain](#blockchain)
 * [Go](#go)
 * [HTML and CSS](#html-and-css)
+* [Java](#java)
 * [JavaScript](#javascript)
 * [Linux](#linux)
 * [PHP](#php)
@@ -27,6 +28,11 @@
 * [HTML & CSS - Beginner To Super Beginner](https://lwinmoepaing.github.io/books/) - Lwin Moe Paing (PDF)
 
 
+### Java
+
+* [Design Patterns](https://designpatterns.saturngod.net) - Saturngod
+
+
 ### JavaScript
 
 * [API - On Point](https://eimaung.com/api/) - Ei Maung (PDF)