feat: initial version

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

lib/Client/Protocol/Command/AuthenticateCommand.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gricob\IMAP\Protocol\Command;
+
+use Gricob\IMAP\Protocol\Command\Authenticate\SASLMechanism;
+
+readonly class AuthenticateCommand extends Command implements Continuable
+{
+    public function __construct(private SASLMechanism $mechanism)
+    {
+        parent::__construct('AUTHENTICATE', $mechanism);
+    }
+
+    public function continue(): string
+    {
+        return $this->mechanism->continue();
+    }
+}