Add Flipkart (#2375)

README.md

@@ -1122,6 +1122,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Dummy Products](https://dummyproducts-api.herokuapp.com/) | An api to fetch dummy e-commerce products JSON data with placeholder images | `apiKey` | Yes | Yes |
 | [eBay](https://go.developer.ebay.com/) | Sell and Buy on eBay | `OAuth` | Yes | Unknown |
 | [Etsy](https://www.etsy.com/developers/documentation/getting_started/api_basics) | Manage shop and interact with listings | `OAuth` | Yes | Unknown |
+| [Flipkart Marketplace](https://seller.flipkart.com/api-docs/FMSAPI.html) | Product listing management, Order Fulfilment in the Flipkart Marketplace | `OAuth` | Yes | Yes |
 | [Lazada](https://open.lazada.com/doc/doc.htm) | Retrieve product ratings and seller performance metrics | `apiKey` | Yes | Unknown |
 | [Mercadolibre](https://developers.mercadolibre.cl/es_ar/api-docs-es) | Manage sales, ads, products, services and Shops | `apiKey` | Yes | Unknown |
 | [Shopee](https://open.shopee.com/documents?version=1) | Shopee's official API for integration of various services from Shopee | `apiKey` | Yes | Unknown |