Update README.md

Author: AnghelLeonard

HibernateSpringBootElementCollectionJoinFetch/README.md

@@ -1 +1,7 @@
+**[How To JOIN FETCH an @ElementCollection](https://github.com/AnghelLeonard/Hibernate-SpringBoot/tree/master/HibernateSpringBootElementCollectionJoinFetch)**
 
+**Description:** This application is an example applying `JOIN FETCH` to fetch an `@ElementCollection`.
+
+**Key points:**\
+     - by default, `@ElementCollection` is loaded lazy, keep it lazy\
+     - use `JOIN FETCH` in the repository