Added a note about Sodium PHP extension

Sodium PHP extension is required by https://github.com/box-project/box

Author: theHocineSaad

installation.md

@@ -5,7 +5,9 @@ description: Create a new Laravel Zero project
 
 # Installation
 
-> **Requires [PHP 8.1+](https://php.net/releases)**
+> **Requires:**
+>- [PHP 8.1+](https://php.net/releases).
+>- `sodium` PHP extension (required by box-project/box - the application bundler we use).
 
 Laravel Zero utilizes [Composer 2](https://getcomposer.org) to manage its dependencies. So, before using Laravel Zero, make sure you have Composer installed on your machine.