[220402] 나머지 개발 완료

- purchase 도메인 command, query 개발
- payment 도메인 command, query 개발
- readme update

payment-command/src/main/java/com/example/purchase/domain/Purchase.java

@@ -0,0 +1,55 @@
+package com.example.purchase.domain;
+
+import com.example.payment.domain.Payment;
+import com.example.user.domain.User;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
+import java.util.UUID;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+@Entity
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@EntityListeners(AuditingEntityListener.class)
+public class Purchase {
+
+    @Id
+    private String id;
+
+    @ManyToOne
+    @JoinColumn
+    private User user;
+
+    private PurchaseType type;
+
+    private BigDecimal amount;
+
+    @CreatedDate
+    private ZonedDateTime createdAt;
+
+    @LastModifiedDate
+    private ZonedDateTime updatedAt;
+
+    public String getId() {
+        return id;
+    }
+
+    public ZonedDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public static Purchase of(User user, PurchaseType type, BigDecimal amount, ZonedDateTime createdAt, ZonedDateTime updatedAt) {
+        return new Purchase(UUID.randomUUID().toString(), user, type, amount, createdAt, updatedAt);
+    }
+}