Added a new Java course (#5568)

* Added new MOOC resource

* Changed alphabetical order

* Added a new Java course

* removed trailing slash

* Delete free-programming-books.md

seeing if I can fix this PR - apologies in advance  if it messes things up

* Update courses/free-courses-en.md
Co-authored-by: NDavid Ordás <davorpatech@gmail.com>
Co-authored-by: NEric Hellman <eric@hellman.net>
Co-authored-by: NDavid Ordás <davorpatech@gmail.com>

courses/free-courses-en.md

@@ -388,6 +388,7 @@
 * [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)
 * [Java Programming](https://testautomationu.applitools.com/java-programming-course/) - Angie Jones (Applitools)
+* [Java Programming](https://java-programming.mooc.fi) - University of Helsinki
 * [Java Programming: Solving Problems with Software](https://www.coursera.org/learn/java-programming) - (Coursera)
 * [Java tutorial for beginners](https://youtube.com/playlist?list=PLZPZq0r_RZOMhCAyywfnYLlrjiVOkdAI1) - Bro Code (YouTube)
 * [Learn how to program: Java](https://www.learnhowtoprogram.com/java-june-2017) - Epicodus Inc.