Better Error Message during the sign up process

[hanseaston]

This is a similar issue compared to #13

We also want to display a better message if a user fails to sign up (wrong confirming password, email already used, etc..)

Please coordinate with the person who is/will be in charge of #13 to discuss what error message should be display and what error message component should be created (it should be a reusable error message component).

Check out the documentation https://firebase.google.com/docs/reference/js/firebase.auth

[harsh863]

@hanszhang00 , i want to work on this.

[neverdue]

Thank you for helping us out @harsh863!
I'll go ahead and assign this issue to you.