add docs on amazon product scrapingbee client (#17)

Author: ziming

README.md

@@ -167,6 +167,22 @@ Look at the source code of `src/LaravelScrapingBeeAmazonSearch.php` for the othe
 
 [LaravelScrapingBeeAmazonSearch.php](https://github.com/ziming/laravel-scrapingbee/blob/main/src/LaravelScrapingBeeAmazonSearch.php)
 
+#### The Amazon Product ScrapingBee Client
+
+```php
+$amazonProductScrapingBeeClient = Ziming\LaravelScrapingBee\LaravelScrapingBeeAmazonProduct::make();
+
+$response = $amazonProductScrapingBeeClient
+    ->query('ASIN')
+    ->device('desktop')
+    ->currency('usd')
+    ->country('gb')
+    ->get();
+```
+
+Look at the source code of `src/LaravelScrapingBeeAmazonProduct.php` for the other methods (link below).
+[LaravelScrapingBeeAmazonProduct.php](https://github.com/ziming/laravel-scrapingbee/blob/main/src/LaravelScrapingBeeAmazonProduct.php)
+
 ## Testing
 
 Currently, there are no tests as it uses credits. But if there are tests in the future, you can run the command below to execute the testcases.

src/LaravelScrapingBeeAmazonProduct.php

@@ -66,6 +66,20 @@ public function query(string $productAsin): self
         return $this;
     }
 
+    /**
+     * Alias for query method
+     *
+     * ASIN stands for Amazon Standard Identification Number
+     *
+     * @see query()
+     */
+    public function asin(string $productAsin): self
+    {
+        $this->params['query'] = $productAsin;
+
+        return $this;
+    }
+
     /**
      * https://www.scrapingbee.com/documentation/amazon/#device_AmazonProduct
      */