Feature: Add Inputs validation for signUp() --AuthService

[abdoulc]

Description

No inputs validation for user registration in AuthService.signUp() ,

ie:
Test case

api/auth/register

body
{ "firstName":"", "lastName":"", "email":"", "password":"", "username":"" }

response:
{ "success": true, "message": "User registered and logged in successfully", "user": { "id": "4f16c680-bde5-4e2c-ae61-215aad60adda", "firstName": "", "lastName": "", "email": "", "username": "", "role": "USER", "verified": true }, "token": "..." }

Acceptance Criteria

1. At least username & password must not be empty or null
2. Verify well formated email (ie: test@...)

[ArhamSyed]

hi, I would like to work on this