README.md: add link to AUR page

README.md

@@ -12,7 +12,7 @@ It is loosely inspired by Bitsquid (now Stingray) engine and its design principl
   * [Crown v0.39.0 for Linux 64-bits](https://github.com/dbartolini/crown/releases/download/v0.39.0/crown-0.39.0-linux-x64.tar.gz)
   * [Crown v0.39.0 for Windows 64-bits](https://github.com/dbartolini/crown/releases/download/v0.39.0/crown-0.39.0-windows-x64.zip)
   
-### Arch Linux (AUR)
+### Arch Linux ([AUR](https://aur.archlinux.org/packages/crown/))
     yay -S crown
   
 ## Support & Development