Hi and welcome to the forum! You’ll have to install Composer on your PC, run composer install and only then will you be able to upload your Laravel project on here.
If you already installed the dependencies and everything and then uploaded it, but want to make your Laravel website accessible when users access your website with / at the end (because the actual website is on the /public/ folder) create a .htaccess file on your htdocs folder or edit it with this content: