initial COmmit: Add KB Antora Importer plugin files

kb-antora-importer/includes/Import/ImportJob.php

@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace KbAntoraImporter\Import;
+
+final class ImportJob
+{
+    public function __construct(
+        public readonly string $projectId,
+        public readonly string $branch,
+        public readonly bool $dryRun = false
+    ) {
+    }
+}