Add JpaRepository

...rc/main/java/org/fuseri/moduleexercise/answer/Answer.java

...n/java/org/fuseri/moduleexercise/answer/AnswerFacade.java

...va/org/fuseri/moduleexercise/answer/AnswerRepository.java

...rg/fuseri/moduleexercise/answer/AnswerRepositoryImpl.java

...n/java/org/fuseri/moduleexercise/common/DomainObject.java

...va/org/fuseri/moduleexercise/common/DomainRepository.java

...rg/fuseri/moduleexercise/common/DomainRepositoryImpl.java

.../java/org/fuseri/moduleexercise/common/DomainService.java

...ain/java/org/fuseri/moduleexercise/exercise/Exercise.java

...rg/fuseri/moduleexercise/exercise/ExerciseRepository.java

...useri/moduleexercise/exercise/ExerciseRepositoryImpl.java

...ain/java/org/fuseri/moduleexercise/question/Question.java

...va/org/fuseri/moduleexercise/question/QuestionFacade.java

...rg/fuseri/moduleexercise/question/QuestionRepository.java

...useri/moduleexercise/question/QuestionRepositoryImpl.java

...module-exercise/src/main/resources/application.properties

...java/org/fuseri/moduleexercise/question/QuestionTest.java