Feat: Comment 기능구현

* Feat : Comment 기본코드 가져오기
- 이전에 작성한 깃이 꼬여서 다시 가져왔습니다..

* Fix : Comment - Member Id 연관관계 매핑

* Fix: Comment - @NotNull 적용

src/main/java/notai/comment/application/CommentQueryService.java

@@ -0,0 +1,4 @@
+package notai.comment.application;
+
+public class CommentQueryService {
+}

src/main/java/notai/comment/application/CommentService.java

@@ -0,0 +1,4 @@
+package notai.comment.application;
+
+public class CommentService {
+}

src/main/java/notai/comment/domain/Comment.java

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+package notai.comment.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotNull;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import notai.common.domain.RootEntity;
+import notai.member.domain.Member;
+
+import static jakarta.persistence.GenerationType.IDENTITY;
+import static lombok.AccessLevel.PROTECTED;
+
+@Entity
+@Table(name = "comment")
+@Getter
+@NoArgsConstructor(access = PROTECTED)
+@AllArgsConstructor
+public class Comment extends RootEntity<Long> {
+    @Id
+    @GeneratedValue(strategy = IDENTITY)
+    private Long id;
+    @ManyToOne
+    @NotNull
+    @JoinColumn(name = "member_id")
+    private Member member;
+    @NotNull
+    @Column
+    private Long postId;
+    @NotNull
+    @Column
+    private Long parentCommentId;
+    @NotNull
+    @Column(length = 255)
+    private String content;
+    public Comment(
+            Member member,
+            Long postId,
+            String content
+    ) {
+        this.member = member;
+        this.postId = postId;
+        this.content = content;
+    }
+
+}

src/main/java/notai/comment/domain/CommentRepository.java

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+package notai.comment.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface CommentRepository extends JpaRepository<Comment, Long> {
+
+}

src/main/java/notai/comment/presentation/CommentController.java

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+package notai.comment.presentation;
+
+public class CommentController {
+}