Fix/readme update
* Add project for hibernate immutable article
Add Event entity
Add hibernate configuration file
Add hibernateutil for configuration
Add test to match snippets from article
* Update Readme for core-java and spring-hibernate4
* Updating repo
- [Eager/Lazy Loading In Hibernate](http://www.baeldung.com/hibernate-lazy-eager-loading)
- [Hibernate Criteria Queries](http://www.baeldung.com/hibernate-criteria-queries)
- [Hibernate One to Many Annotation Tutorial](http://www.baeldung.com/hibernate-one-to-many)
+- [Guide to @Immutable Annotation in Hibernate](http://www.baeldung.com/hibernate-immutable)
### Quick Start
