[ADD] 収支のためのModelを作成しました。

src/main/java/com/example/demo/app/domain/model/TransactionModel.java

@@ -0,0 +1,22 @@
+package com.example.demo.app.domain.model;
+
+import java.time.LocalDate;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class TransactionModel {
+
+	private Long transactionId;
+	
+	private Long userId;
+	
+	private Long categoryId;
+	
+	private Integer amount;
+	
+	private LocalDate transactionDate;
+	
+}