Adds llms.txt badge

Author: raphaelstolt

README.md

@@ -5,6 +5,7 @@
 ![PHP Version](https://img.shields.io/badge/php-8.1+-ff69b4.svg)
 [![composer.lock available](https://poser.pugx.org/stolt/lean-package-validator/composerlock)](https://packagist.org/packages/stolt/lean-package-validator)
 [![PDS Skeleton](https://img.shields.io/badge/pds-skeleton-blue.svg?style=flat)](https://github.com/php-pds/skeleton)
+![llms.txt](https://img.shields.io/badge/llms.txt-available-blue.svg?style=flat)
 
 <p align="center">
     <img src="lpv-logo.png"