docs: add documentation on AUR installation

Signed-off-by: Julian POIDEVIN <[email protected]>
Signed-off-by: Julian POIDEVIN <[email protected]>

README.md

@@ -66,6 +66,8 @@
 
 > **Everything here is created on rofi version : `1.7.4`**
 
+### From source
+
 * First, Make sure you have the same (stable) version of rofi installed.
   - On Arch / Arch-based : **`sudo pacman -S rofi`**
   - On Debian / Ubuntu : **`sudo apt-get install rofi`**
@@ -98,6 +100,15 @@ $ ./setup.sh
 
 > **Note** : These themes are like an ecosystem, everything here is connected with each other in some way. So... before modifying anything by your own, make sure you know what you doing.
 
+### Arch Linux
+This collection is available on the [AUR](https://aur.archlinux.org/packages/rofi-adi1090x), you can install it with `makepkg` or using an AUR helper.
+
+```sh
+git clone https://aur.archlinux.org/rofi-adi1090x.git
+cd rofi-adi1090x
+makepkg -Ccsi
+```
+
 ---
 
 <p align="center">