feat: initial version

Signed-off-by: Sebastian Krupinski <root@LAPTOP-7DVOR6NC>

lib/Client/Protocol/Response/Line/Data/ExistsData.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gricob\IMAP\Protocol\Response\Line\Data;
+
+final readonly class ExistsData implements Data
+{
+    public function __construct(public int $numberOfMessages)
+    {
+    }
+}