Add a hint to share commands

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Command/Command/Add.php

@@ -109,5 +109,9 @@ class Add extends Base {
 		$output->writeln('<info>Command added</info>');
 		$output->writeln('');
 		$this->renderCommands(Base::OUTPUT_FORMAT_PLAIN, $output, [$command]);
+
+		$output->writeln('');
+		$output->writeln("<comment>If you think your command makes sense for other users as well, feel free to share it in the following github issue:\n https://github.com/nextcloud/spreed/issues/1566</comment>");
+
 	}
 }