Feat : 알림 도메인 생성

#51

src/main/java/com/steady/steadyback/domain/Alarm.java

@@ -0,0 +1,41 @@
+package com.steady.steadyback.domain;
+
+import com.sun.istack.NotNull;
+import lombok.Builder;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Entity
+@NoArgsConstructor
+@Table(name = "alarm")
+public class Alarm {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotNull
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @NotNull
+    @Column(name = "read_flag")
+    private Boolean readFlag;
+
+    @NotNull
+    @Column(length = 100)
+    private String message;
+
+    @NotNull
+    @Column
+    private Integer type;
+
+    @Builder
+    public Alarm(User user, Boolean readFlag, String message, Integer type) {
+        this.user = user;
+        this.readFlag = readFlag;
+        this.message = message;
+        this.type = type;
+    }
+}

src/main/java/com/steady/steadyback/domain/AlarmRepository.java

@@ -0,0 +1,8 @@
+package com.steady.steadyback.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface AlarmRepository extends JpaRepository<Alarm, Long> {
+}