Add JavaORM Content (#1693)

* Update readme.md

* Update content/roadmaps/110-java/content/104-java-orm/readme.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/110-java/content/104-java-orm/readme.md

@@ -1 +1,7 @@
-# Java orm
+# ORM (Object-Relational Mapping)
+
+A programming method to map objects in Java to relational entities in a database. In other words, converting data between relational databases and object-oriented programming languages. Some popular ORM tools/frameworks in Java are:
+
+- Spring Data JPA 
+- Hibernate
+- Ebean