Add a link to "Hello JPA Repository"

Author: tboychuk

README.md

@@ -9,4 +9,5 @@ Working on real problems, you're focused on finding a solution. Learning new thi
 It is important to have a different type of activities, which purpose is improving your skill 
 
 ***An exercise** is a predefined task that you continuously implement to improve a certain skill* :muscle:
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+* [Hello JPA Repository](https://github.com/bobocode-projects/spring-data-jpa-exercises/tree/master/hello-jpa-repository)