TOTP based file manager

Using this user can upload files using totp based authentication system, and open for all to download.

Steps to setup:

1. run composer install and composer dump-autoload to install dependencies
2. run the server
3. open /secret.php to generate secret and scan it to your authenticator app (i use Aegis)
4. now paste this secret to index.php's TOTP_SECRET constant
5. done