Added "Hibernate 4 Example Programs"

free-programming-books.md

@@ -844,6 +844,7 @@
 * [Core Servlets and JavaServer Pages](http://pdf.coreservlets.com/) - Marty Hall and Larry Brown
 * [Data Structures and Algorithms with Object-Oriented Design Patterns in Java](http://www.brpreiss.com/books/opus5/html/page9.html)
 * [Google's Java Style Guide](http://google-styleguide.googlecode.com/svn/trunk/javaguide.html)
+* [Hibernate 4 Example Programs](https://leanpub.com/hibernate4-example-programs) - L. Mohan Arun
 * [HTTP Programming Recipes for Java Bots](http://www.heatonresearch.com/articles/series/16)
 * [Introduction to Computer science using Java](http://chortle.ccsu.edu/java5/index.html)
 * [Introduction to Neural Networks with Java](http://www.heatonresearch.com/articles/series/1) -