add swingmusic to media streaming (#3689)

README.md

@@ -1237,6 +1237,7 @@ _See also: [List of streaming media systems - Wikipedia](https://en.wikipedia.or
 - [Snapcast](https://github.com/badaix/snapcast) - Synchronous multiroom audio server. `GPL-3.0` `C++`
 - [Stretto](https://github.com/benkaiser/stretto) - Music player with Youtube/Soundcloud import and iTunes/Spotify discovery. ([Demo](https://next.kaiserapps.com), [Clients](https://github.com/benkaiser/stretto-mobile-next)) `MIT` `Nodejs`
 - [Supysonic](https://github.com/spl0k/supysonic) - Python implementation of the Subsonic server API. `AGPL-3.0` `Python`
+- [SwingMusic](https://swingmusic.vercel.app/) - Swing Music is a beautiful, self-hosted music player and streaming server for your local audio files. Like a cooler Spotify ... but bring your own music. ([Source Code](https://github.com/swing-opensource/swingmusic)) `MIT` `Python`
 - [Volumio](https://volumio.com/) - A free and open source linux distribution, designed and fine-tuned exclusively for music playback. ([Source Code](https://github.com/volumio/Volumio2)) `GPL-3.0` `Nodejs`
 - [ympd](https://ympd.org/) - Standalone MPD Web GUI written in C, utilizing Websockets and Bootstrap/JS. ([Source Code](https://github.com/notandy/ympd)) `GPL-2.0` `C`