code: public com.authy.api.User createUser(String email, String phone, String countryCode) throws AuthyException {
          User user = new User(email, phone, countryCode);
          final Response response = this.post(NEW_USER_PATH, user);
          return userFromJson(response.getStatus(), response.getBody());
      }
docs: Create a new user using his e-mail, phone and country code.
  
  @param email
  @param phone
  @param countryCode
  @return a User instance