addEntity method
Add a PublicMediumEntity to the repository, cached
Implementation
@override
Future<PublicMediumEntity> addEntity(
    String documentID, PublicMediumEntity value) {
  return reference.addEntity(documentID, value);
}Add a PublicMediumEntity to the repository, cached
@override
Future<PublicMediumEntity> addEntity(
    String documentID, PublicMediumEntity value) {
  return reference.addEntity(documentID, value);
}