started implementation of occ command

appinfo/info.xml

@@ -17,4 +17,7 @@
         <database>mysql</database>
         <nextcloud min-version="29" max-version="29"/>
     </dependencies>
+    <commands>
+		<command>OCA\GroupfolderTags\Command\Tag</command>
+    </commands>
 </info>

lib/Command/Tag.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\GroupfolderTags\Command;
+
+use OC\Core\Command\Base;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Tag extends Base {
+	public function __construct() {
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this
+			->setName('groupfolder-tags:update')
+			->setDescription('Update or add a tag (and optional tag value) to a groupfolder by id')
+			->addOption(
+				'groupfolder_id',
+				null,
+				InputOption::VALUE_REQUIRED,
+				'Add or update tag of the given groupfolder id'
+			)
+			->addOption(
+				'tag_key',
+				null,
+				InputOption::VALUE_REQUIRED,
+				'Set tag key to given value'
+			)
+			->addOption(
+				'tag_value',
+				null,
+				InputOption::VALUE_OPTIONAL,
+				'Set tag value to given value'
+			);
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$groupFolderId = $input->getOption('groupfolder_id');
+		$tagKey = $input->getOption('tag_key');
+		$tagValue = $input->getOption('tag_value');
+
+		$output->writeln($groupFolderId . " " . $tagKey . " " . $tagValue);
+		return 0;
+	}
+}