// install d8 dev
$ git clone --branch 8.0.x http://git.drupal.org/project/drupal.git
// download example module
https://s3.amazonaws.com/gitter-uploads-prod/hechoendrupal/DrupalAppConsole/rI6z/example.tar.gz
// enable module
$ drush en -y example
// Open URL example/settings/EventForm
// Fill form and click Save configuration
verify form hold value fields after submit
// Confirm form settings are stored
$ drupal config:debug | grep example