[:lang racket] Mention Arch packages

modules/lang/racket/README.org

@@ -9,6 +9,7 @@
   - [[#module-flags][Module Flags]]
   - [[#plugins][Plugins]]
 - [[#prerequisites][Prerequisites]]
+  - [[#arch-linux][Arch Linux]]
 - [[#features][Features]]
 - [[#configuration][Configuration]]
   - [[#racket-smart-open-bracket-mode][racket-smart-open-bracket-mode]]
@@ -31,6 +32,18 @@ This module has no dedicated maintainers.
 This module only requires ~racket~. Install it directly from the [[https://download.racket-lang.org/][racket website]],
 or check your package manger.
 
+** Arch Linux
+
+#+begin_src bash
+pacman -S racket
+#+end_src
+
+Or, for fewer dependencies:
+
+#+begin_src bash
+pacman -S racket-minimal
+#+end_src
+
 * TODO Features
 
 * Configuration