composer create-project drupal-composer/drupal-project:8.x-dev demo --stability dev --no-interaction
cd into the demo directory and type composer install
update /usr/local/etc/httpd/extra/httpd-vhosts.conf for demo.d8 sudo nano /etc/hosts and point demo.d8 to 127.0.0.1
go to https://demo.d8 and install drupal