Added Contributing to opensource: the right way (#8523)

* Added Contributing to opensource: the right way

* author inserted

* Alphabetically ordered

books/free-programming-books-subjects.md

@@ -633,6 +633,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 
 ### Open Source Ecosystem
 
+* [Contributing to opensource: the right way](https://github.com/Mte90/Contribute-to-opensource-the-right-way) - Daniele Scasciafratte
 * [Data Journalism Handbook](http://datajournalismhandbook.org)
 * [Free as in Freedom: Richard Stallman and the free software revolution](https://archive.org/details/faif-2.0) - Sam Williams (PDF)
 * [Free for All](https://unglue.it/work/136445/) - Peter Wayner