add Freesound API

README.md

@@ -580,6 +580,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Bandsintown](https://app.swaggerhub.com/apis/Bandsintown/PublicAPI/3.0.0) | Music Events | No | Yes | Unknown |
 | [Deezer](https://developers.deezer.com/api) | Music | `OAuth` | Yes | Unknown |
 | [Discogs](https://www.discogs.com/developers/) | Music | `OAuth` | Yes | Unknown |
+| [Freesound](https://freesound.org/docs/api/) | Music Samples | `apiKey` | Yes | Unknown |
 | [Genius](https://docs.genius.com/) | Crowdsourced lyrics and music knowledge | `OAuth` | Yes | Unknown |
 | [Genrenator](https://binaryjazz.us/genrenator-api/) | Music genre generator | No | Yes | Unknown |
 | [iTunes Search](https://affiliate.itunes.apple.com/resources/documentation/itunes-store-web-service-search-api/) | Software products | No | Yes | Unknown |