Add barter.vg API

Barter.vg is a website to trade your spare game serial codes. However, it also provides a lot of data about games, bundles and more.

README.md

@@ -462,6 +462,7 @@ API | Description | Auth | HTTPS | CORS |
 | [AmiiboAPI](https://amiiboapi.com/) | Nintendo Amiibo Information | No | Yes | Yes |
 | [Animal Crossing: New Horizons](http://acnhapi.com/) | API for critters, fossils, art, music, furniture and villagers | No | Yes | Unknown |
 | [Autochess VNG](https://github.com/didadadida93/autochess-vng-api) | Rest Api for Autochess VNG | No | Yes | Yes |
+| [Barter.VG](https://github.com/bartervg/barter.vg/wiki) | Provides information about Game, DLC, Bundles, Giveaways, Trading | No | Yes | Yes |
 | [Board Game Geek](https://boardgamegeek.com/wiki/page/BGG_XML_API2) | Board games, RPG and videogames | No | Yes | No |
 | [Brawl Stars](https://developer.brawlstars.com) | Brawl Stars Game Information | `apiKey` | Yes | Unknown |
 | [CheapShark](https://www.cheapshark.com/api) | Steam/PC Game Prices and Deals | No | Yes | Yes |