Alcole java courses (#3052)

* added Solidity

* added Solidity

* added Solidity

* bitcoin book added

* fixed ordering on bitcoin book entry

* added authors for bitcoin and solidity books

* added Bitcoin and cryptocurrency Princeton book

* mooc.fi Java courses added

free-courses-en.md

@@ -205,6 +205,8 @@
 * [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)
 * [Learn how to program: Java](https://www.learnhowtoprogram.com/java-june-2017) - Epicodus Inc.
+* [Object-Oriented programming with Java, part I](https://moocfi.github.io/courses/2013/programming-part-1/)
+* [Object-Oriented programming with Java, part II](https://moocfi.github.io/courses/2013/programming-part-2/)
 * [Princeton Algorithms, Part 1](https://www.coursera.org/course/algs4partI)
 * [Princeton Algorithms, Part 2](https://www.coursera.org/course/algs4partII)
 * [Problem Solving With Java](https://www.udacity.com/course/intro-to-java-programming--cs046)