Add Java courses, check_urls=free-courses-en.md (#5139)

free-courses-en.md

@@ -354,6 +354,7 @@
 * [Central Connecticut State University, Introduction to CS Using Java](http://chortle.ccsu.edu/CS151/cs151java.html)
 * [CS106A - Programming Methodology](https://see.stanford.edu/Course/CS106A) - (Stanford)
 * [Introduction to Java](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-092-introduction-to-programming-in-java-january-iap-2010/)
+* [Java Design Patterns and Architecture](https://www.udemy.com/course/java-design-patterns-tutorial) - John Purcell (Udemy)
 * [Java for Complete Beginners](http://courses.caveofprogramming.com/courses/java-for-complete-beginners)
 * [Java for Mobile Devices - Introducing Codename One](https://codenameone.teachable.com/p/java-for-mobile-devices-introducing-codename-one)
 * [Java Online Training | Edureka](https://www.youtube.com/watch?v=hBh_CC5y8-s) - (Edureka)