add Ada for the C++ or Java Developer (#3227)

* add introduction to Ada course book

* Change book to add

Add Ada for the C++ or Java Developer book instead.

* add author name to an ada book

* Update free-programming-books.md

free-programming-books.md

@@ -781,6 +781,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 * [A Guide to Ada for C and C++ Programmers](http://www.cs.uni.edu/~mccormic/4740/guide-c2ada.pdf) (PDF)
 * [Ada Distilled](http://www.adapower.com/pdfs/AdaDistilled07-27-2003.pdf) (PDF)
+* [Ada for the C++ or Java Developer](https://www.adacore.com/uploads/books/pdf/Ada_for_the_C_or_Java_Developer-cc.pdf) - Quentin Ochem (PDF)
 * [Ada Programming](https://en.wikibooks.org/wiki/Ada_Programming) - Wikibooks
 * [Ada Reference Manual - ISO/IEC 8652:2012(E) Language and Standard Libraries](http://www.ada-auth.org/standards/12rm/RM-Final.pdf) (PDF)
 * [The Big Online Book of Linux Ada Programming](http://www.pegasoft.ca/resources/boblap/book.html)