code: def create_user(options={})
        user=User.new(options)
        user.validate_for_create!
        body = user_hash(user.to_hash)
        response=oauth_access_token.post('/v1/users', body: body)
        User.new(response.parsed)
      end
docs: Create a user from the options
   @param [Hash] options
   @option options [String] :email The new user's email address
   @option options [String] :password The new user's password
   @option options [String] :password_confirmation The new user's password confirmation string
   @return [G5AuthenticationClient::User]