[feat] Playlist 도메인, repository 추가

src/main/java/com/mookive/mookive_backend/playlist/domain/entity/Playlist.java

@@ -0,0 +1,29 @@
+package com.mookive.mookive_backend.playlist.domain.entity;
+
+import com.mookive.mookive_backend.user.domain.entity.User;
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Playlist {
+
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String name;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Builder
+    public Playlist(String name, User user) {
+        this.name = name;
+        this.user = user;
+    }
+}