def create_user(user)
      user_response  = Echochamber::Request.create_user(user, token)
      user_response.fetch("userId")
    end
def create_user(user)
      user_response  = Echochamber::Request.create_user(user, token)
      user_response.fetch("userId")
    end
Initializes the Client object

 @param credentials [Echochamber::Credentials] Initialized Echochamber::Credentials
 @return [Echochamber::Client] Initialized Echochamber::Client
 Creates a user for the current application

 @param user [Echochamber::User]
 @return [String] User ID of new Echosign user