title: How to create custom user pool on cognito, and connect this to your application
body: <p>I would like to use the <code>out-of-the-box</code> user account creation with cognito, and am able to do that. But I would like to add custom attributes.
  Now, is there a way, using the terminal, that you can ask amplify to use the user pool you have created, instead of the default one that it generates for you?</p>