feat: initial version

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

lib/Client/Protocol/Command/AppendCommand.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gricob\IMAP\Protocol\Command;
+
+use DateTimeInterface;
+use Gricob\IMAP\Protocol\Command\Argument\DateTime;
+use Gricob\IMAP\Protocol\Command\Argument\QuotedString;
+use Gricob\IMAP\Protocol\Command\Argument\SynchronizingLiteral;
+use Gricob\IMAP\Protocol\Command\Argument\ParenthesizedList;
+
+final readonly class AppendCommand extends Command implements Continuable
+{
+    /**
+     * @param list<string>|null $flags
+     */
+    public function __construct(
+        string $mailboxName,
+        private string $message,
+        ?array $flags,
+        ?DateTimeInterface $internalDate
+    ) {
+        parent::__construct(
+            'APPEND',
+            ...array_filter([
+                new QuotedString($mailboxName),
+                ParenthesizedList::tryFrom($flags),
+                DateTime::tryFrom($internalDate),
+                new SynchronizingLiteral($this->message),
+            ])
+        );
+    }
+
+    public function continue(): string
+    {
+        return $this->message;
+    }
+}