feat: implement initial read only access

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Host/HostException.php

@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+namespace KTXM\ServiceWopi\Host;
+
+class HostException extends \RuntimeException
+{
+    public function __construct(string $message, public readonly int $status = 400)
+    {
+        parent::__construct($message);
+    }
+}