changes in readme file

Author: kshitij verma

test/index.php

@@ -0,0 +1,20 @@
+<?php
+require(__DIR__ . '/../vendor/autoload.php');
+
+use Shopify\PrivateApp;
+use rdx\graphqlquery\Query;
+
+$shop = 'jewellerystones.myshopify.com';
+$api_key = '4ba2e1a4c6324358ef8d51995b59b8d8';
+$password = '21045bc023f2af12733de9f4b737d865';
+$api_params['version'] = '2019-07';
+try {
+    $client = new Shopify\PrivateApp($shop, $api_key, $password, $api_params);
+    /**rest api call**/
+    $response = $client->call('GET', 'products', ['limit' => 1]);
+    print_r($response);
+}
+catch (\Shopify\Exception\ApiException $e)
+{
+    echo "Errors: ".$e->getError().'<br> status code: '.$e->getCode();
+}