feat(model): add initial entity models for restaurant system

src/main/java/dev/model/Order.java

@@ -0,0 +1,15 @@
+package dev.model;
+
+import java.time.LocalDateTime;
+
+public class Order {
+
+    private int id;
+
+    private int userId;
+
+    private LocalDateTime createdAt;
+
+    private double totalPrice;
+
+}