[ADD]LoginModelの作成

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

@@ -0,0 +1,10 @@
+package com.example.demo.app.domain.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class LoginModel {
+	private Long userId;
+}