Added Napster (#2214)

README.md

@@ -875,6 +875,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Mixcloud](https://www.mixcloud.com/developers/) | Music | `OAuth` | Yes | Yes |
 | [MusicBrainz](https://musicbrainz.org/doc/Development/XML_Web_Service/Version_2) | Music | No | Yes | Unknown |
 | [Musixmatch](https://developer.musixmatch.com/) | Music | `apiKey` | Yes | Unknown |
+| [Napster](https://developer.napster.com/api/v2.2) | Music | `apiKey` | Yes | Yes |
 | [Openwhyd](https://openwhyd.github.io/openwhyd/API) | Download curated playlists of streaming tracks (YouTube, SoundCloud, etc...) | No | Yes | No |
 | [Songkick](https://www.songkick.com/developer/) | Music Events | `OAuth` | Yes | Unknown |
 | [Songlink / Odesli](https://www.notion.so/API-d0ebe08a5e304a55928405eb682f6741) | Get all the services on which a song is available | `apiKey` | Yes | Yes |