feat: initial version

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

lib/Client/Protocol/Command/Argument/Search/Header.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Gricob\IMAP\Protocol\Command\Argument\Search;
+
+use Gricob\IMAP\Protocol\Command\Argument\QuotedString;
+
+class Header implements Criteria
+{
+    public function __construct(
+        private string $fieldName,
+        private string $value,
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return sprintf('HEADER %s %s', $this->fieldName, new QuotedString($this->value));
+    }
+}