Add balldontlie API (#860)

README.md

@@ -688,6 +688,7 @@ API | Description | Auth | HTTPS | CORS |
 ### Sports & Fitness
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [balldontlie](https://balldontlie.io) | Ballldontlie provides access to stats data from the NBA | No | Yes | Yes |
 | [BikeWise](https://www.bikewise.org/documentation/api_v2) | Bikewise is a place to learn about and report bike crashes, hazards and thefts | No | Yes | Unknown |
 | [Cartola FC](https://github.com/wgenial/cartrolandofc) | The Cartola FC API serves to check the partial points of your team | No | Yes | Unknown |
 | [City Bikes](http://api.citybik.es/v2/) | City Bikes around the world | No | No | Unknown |