Improvements and add funcionality

[alvaaz]

youtube/videos/why-i-love-usereducer/src/LoginUseReducer.js

Line 12 in e10e060

case 'login': {

I want add new funcionality to form:

1. Reset password interaction
2. Button sumbit disable during email is not valid
3. Button sumbit disable during a minimum number of password characters

I did this but I want to know if you have good practices. Also know if it is better to use useReducer for add this funcionalities.

https://codesandbox.io/s/login-s6fpo