Document use with Laravel

> i am using laravel `11.42.1` (latest version) and i am able to connect to crate and get data like this:
>
> ```php
> $connection = app(CrateDB::class)->createConnection();
> $stmt = $connection->query('SELECT id FROM something LIMIT 3');
> $rows = $stmt->doFetchAll(PDO::FETCH_ASSOC);
> ```
>
> and everything is working fine 🤷 😏

_Originally posted by @michabbb in [#160](https://github.com/crate/crate-pdo/issues/160#issuecomment-2654879354)_

Start by reading the Laravel usage example quoted from issue #160 and identify the project's existing documentation entry point; this issue names no file or test. Done means adding clear documentation for using crate-pdo with Laravel, including the demonstrated connection and query flow.

Written by the indexing model from the issue text.