This folder has some scripts which are useful to do several small tasks.
Before running any of them, you should first run composer install to install the dependencies (install Composer if it's not already installed in your computer).
To send emails, run php sendEmails.php < users.csv, where users.csv has a form similar to the sample.csv file.
Before you do that, you should copy config.default.php to config.php and set up the Mailgun API keys. You might also have to change the template ID in the sendEmails.php file.