README modification (#94)

* Update README.md

Add Archlinux AUR package installation

* Update README.md

Author: Ades128

README.md

@@ -39,6 +39,14 @@ Or, you can build the package in a Docker container:
 ```bash
 docker build .
 ```
+Archlinux
+---------
+
+Footswitch is available in the [AUR](https://aur.archlinux.org/packages/footswitch-git) and can be installed using your favourite AUR helper, for example:
+
+- `yay -S footswitch-git`
+- `paru -S footswitch-git`
+
 
 Other systems
 -------------