Add Black History Facts (#2097)

ref #2002 
resolve #1802 

README.md

@@ -862,6 +862,7 @@ API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
 | [18F](http://18f.github.io/API-All-the-X/) | Unofficial US Federal Government API Development | No | No | Unknown |
 | [Archive.org](https://archive.readme.io/docs) | The Internet Archive | No | Yes | Unknown |
+| [Black History Facts](https://blackhistoryapi.io/docs) | Contribute or search one of the largest black history fact databases on the web | `apiKey` | Yes | Yes |
 | [Callook.info](https://callook.info) | United States ham radio callsigns | No | Yes | Unknown |
 | [CARTO](https://carto.com/) | Location Information Prediction | `apiKey` | Yes | Unknown |
 | [CivicFeed](https://developers.civicfeed.com/) | News articles and public datasets | `apiKey` | Yes | Unknown |