Add Mercadolibre (#2063)

Squashs:

* Add Mercadolibre API

* Ordered alphabetically

README.md

@@ -1015,6 +1015,7 @@ 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 |
+| [Mercadolibre](https://developers.mercadolibre.cl/es_ar/api-docs-es) | Manage sales, ads, products, services and Shops | `apiKey` | Yes | Unknown |
 | [Wegmans](https://dev.wegmans.io) | Wegmans Food Markets | `apiKey` | Yes | Unknown |
 
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