[4기 정성현] Mission 1, 2, 3 PR 제출합니다. #313
                
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📌 과제 설명
JPA 위클리 미션 1,2,3 구현입니다!
👩💻 요구 사항과 구현 내용
미션1
미션2 -> (테스트 패키지의 PersistenceContextTest 클래스)
미션3
✅ PR 포인트 & 궁금한 점