exception: username already exists
exception: no username
exception: invalid username
exception: no firstname
exception: invalid firstname
exception: no lastname
exception: invalid lastname
exception: no email
exception: invalid email (no @ and end in .com, .ca)
exception: empty password
exception: invalid password (8-15 characters, at least 1 capital letter, at least one lowercase letter, at least one number)
return: GalleryRegistration
createRegistration(RegistrationDto)
exception: username already exists exception: no username exception: invalid username exception: no firstname exception: invalid firstname exception: no lastname exception: invalid lastname exception: no email exception: invalid email (no @ and end in .com, .ca) exception: empty password exception: invalid password (8-15 characters, at least 1 capital letter, at least one lowercase letter, at least one number) return: GalleryRegistration