Add details, license, type etc to composer.json
Composer discussion at https://chat.civicrm.org/civicrm/pl/kqhekzi3a3rz7bscgjemf6afjh & extensions-directory#9
Composer discussion at https://chat.civicrm.org/civicrm/pl/kqhekzi3a3rz7bscgjemf6afjh & extensions-directory#9