Installation instructions don't work

[michael-schumann]

Hello everyone,

The standard installation does not work according to the instructions.
Error message occurs on a Linux with Apache2 and PHP 8.2

Fatal error: Uncaught Error: Class "Idoit\APIClient\API" not found in /var/www/test/idoit-api/api.php:12 Stack trace: #0 {main} thrown in /var/www/test/idoit-api/api.php on line 12

My Code
`use Idoit\APIClient\API;
use Idoit\APIClient\Idoit;

require_once 'vendor/autoload.php';

$api = new API([
API::URL => 'https://demo.i-doit.com/src/jsonrpc.php',
API::KEY => 'c1ia5q',
API::USERNAME => 'admin',
API::PASSWORD => 'admin'
]);

$request = new Idoit($api);
$info = $request->readVersion();

var_dump($info);`

My environment:
Debian 12, Apache 2.4.57-2 , PHP 8.2.7-1~deb12u1