Added AUR package reference

Author: njkevlani

README.md

@@ -8,7 +8,15 @@ your own risk!
 
 ## Installation
 
-### Option 1: Install a release package (.deb)
+### Option 1: For Arch Linux
+
+Install from AUR.
+
+```shell
+paru -S qmk-light-bin
+```
+
+### Option 2: Install a release package (.deb)
 
 Download the matching package from the latest GitHub release:
 
@@ -27,7 +35,7 @@ If `dpkg` reports missing dependencies, run:
 sudo apt-get install -f
 ```
 
-### Option 2: Build from source
+### Option 3: Build from source
 
 Install build/runtime dependencies: