docs(readme): add void package

Author: JakeStanger

README.md

@@ -130,6 +130,14 @@ A flake is included with the repo which can be used with Home Manager.
 CI builds are automatically cached by Garnix.
 You can use their binary cache by following the steps [here](https://garnix.io/docs/caching).
 
+### Void Linux
+
+[void package](https://github.com/void-linux/void-packages/tree/master/srcpkgs/ironbar)
+
+```sh
+xbps-install ironbar
+```
+
 ### Source
 
 [repo](https://github.com/jakestanger/ironbar)
@@ -183,4 +191,4 @@ All are welcome, but I ask a few basic things to help make things easier. Please
 - [Rustbar](https://github.com/zeroeightysix/rustbar) - Served as a good demo for writing a basic GTK bar in Rust
 - [Smithay Client Toolkit](https://github.com/Smithay/client-toolkit) - Essential in being able to communicate to Wayland
 - [gtk-layer-shell](https://github.com/wmww/gtk-layer-shell) - Ironbar and many other projects would be impossible without this
-- [Mixxc](https://github.com/Elvyria/Mixxc) - Basis for Ironbar's PulseAudio client code and a cool standalone volume widget.
+- [Mixxc](https://github.com/Elvyria/Mixxc) - Basis for Ironbar's PulseAudio client code and a cool standalone volume widget.