Contributing to this project is very different from a normal Drupal project, since it includes core. I tried cloning the project to my local, adding ddev, and then using composer to install dependencies. The result is a site that displays a 403 error. I also tried adding drush but running drush site:install also resulted in a string of errors.
Provide a documentation page with the steps required to git clone the repo locally and then create a functioning Drupal site in ddev, for the purposes of contribution.
Active
11.0
Code
Is there a Drupal core documentation page for the setup you are looking for? It would be the same.
The repository may be out of date somewhat. Looks like the last change was 3 weeks ago. It may need core rebased back into it.