Add Inertia.js in Framework Extras

README.md

 * [Knp RAD Components](https://rad.knplabs.com/) - A set of Rapid Application Development (RAD) components for Symfony.
 * [LaravelS](https://github.com/hhxsv5/laravel-s) - An out-of-the-box adapter between Laravel/Lumen and Swoole.
 * [Livewire](https://livewire.laravel.com/) - Powerful, dynamic, front-end UIs without leaving PHP.
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+* [Inertia.js](https://inertiajs.com/) - Build single-page apps, without building an API.
+ 
 ### Content Management Systems (CMS)
 *Tools for managing digital content.*