README.md: add agrski/polybar-pipewire-wireplumber to user repos

Author: agrski

README.md

@@ -119,6 +119,7 @@ Is this your first time here? You should definitely take a look at these scripts
 * [mikeri/polycmus](https://github.com/mikeri/polycmus): Show what song is playing in cmus
 * [MiksuR/spot-on](https://github.com/MiksuR/spot-on): Resource efficient plugin with text scrolling, written in Haskell.
 * [monadplus/polybar-tidal](https://github.com/monadplus/polybar-tidal): Tidal status and controls
+* [agrski/polybar-pipewire-wireplumber](https://github.com/agrski/polybar-pipewire-wireplumber): Display audio output device information using Pipewire/WirePlumber instead of PulseAudio
 
 #### Tasks/Timers
 * [zemmsoares/polybar-notion](https://github.com/zemmsoares/polybar-notion): Notion todo / task manager display module.