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

src/main/java/dev/model/OrderDetail.java

@@ -0,0 +1,15 @@
+package dev.model;
+
+public class OrderDetail {
+
+    private int id;
+
+    private int orderId;
+
+    private int menuItemId;
+
+    private int quantity;
+
+    private double price;
+
+}