title: I need to add email/password authentication with flutter and firebase
body: <p>I have a <strong>Google authentication</strong> working just <strong>fine</strong>, and I need to create another <strong>signUp</strong> method (with <strong>email/and password</strong>), so what are the best approaches for implementing this <strong><em>signUp</em></strong> method?</p>
  
  <p>I tried to create a user and it worked. But then I <strong>can't navigate</strong> to my other pages! </p>
  
  <p>I couldn't find any good blog posts or documentation. <strong>Note</strong> that when the user signs up I also need to add them in firebase Database.</p>