first change

Modules/Product/app/Interfaces/ProductInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Modules\Product\Interfaces;
+
+interface ProductInterface
+{
+    public function findAll();
+    public function getProductById($productId);
+    public function getProductList();
+    public function create(array $productDetails);
+    public function update($productId, array $newDetails);
+    public function delete($productId);
+    public function pluck();
+    public function count();
+    public function client();
+}