docs: update README

Author: Golevka2001

README.md

@@ -7,9 +7,12 @@ Lyrics submodule for [LyricsX](https://github.com/ddddxxx/LyricsX).
 - NetEase Music
 - QQ Music
 - Kugou Music
-- TTPod
-- Gecimi
-- Syair
+- LRCLIB
+- Spotify
+- Musixmatch
+- <del>TTPod</del>
+- <del>Gecimi</del>
+- <del>Syair</del>
 - <del>Xiami Music</del> (discontinued)
 - <del>ViewLyrics</del> (not working anymore)
 
@@ -40,6 +43,10 @@ provider.lyricsPublisher(request: searchReq).sink { lyrics in
 }
 ```
 
+#### Musixmatch source requires a token
+
+The method for retrieving lyrics from Musixmatch is adapted from [LyricsPlus](https://github.com/spicetify/cli/tree/main/CustomApps/lyrics-plus). To use this feature properly, you need to follow the steps provided [here](https://spicetify.app/docs/faq#sometimes-popup-lyrics-andor-lyrics-plus-seem-to-not-work) to obtain a usertoken.
+
 ## License
 
 LyricsKit is part of LyricsX and licensed under MPL 2.0. See the [LICENSE file](LICENSE).