feat(dao): add initial data access object templates

src/main/java/dev/dao/OrderDetailDao.java

@@ -0,0 +1,24 @@
+package dev.dao;
+
+import dev.model.OrderDetail;
+
+import java.util.List;
+
+public class OrderDetailDao {
+
+    public void save(OrderDetail detail) {
+
+        // TODO:
+        // Insert order detail
+
+    }
+
+    public List<OrderDetail> findByOrderId(int orderId) {
+
+        // TODO:
+        // Retrieve order details
+
+        return null;
+    }
+
+}