Clone this repository. For example with:
git clone git@github.com:eiriksm/drupalnorge-social.git
If you want a database dump, here is one: drupalnorge-social.e-o.no/sanitized.sql
cd into the repository root. Install the composer dependencies. For example with:
composer install
Install drupal. You can do this however you want. One way is to use drush:
drush site-install --db-url=mysql://USER:PASS@HOST/DATABASE