[Feature Request] folder importing support

[lovemilk2333]

Thank you for developing such a great App. Could you add a function to support importing a folder? I have many files that I want to keep private and safe, so I want to import a folder recursively.

For now, because I have rooted my device, I can move my folder to /data/data/org.privacymatters.safespace/files/<code>/path/to/folder and use Termux to chown <app_user_id>:<app_user_id> -R <path> and chmod -R <path> to import my folder. It works perfectly.

Thank you.