title: Symfony4 - 'app/config/config.yml' is missing?
body: <p>I am new with Symfony4, and creating Login Form with <a href="https://symfony.com/doc/master/bundles/FOSUserBundle/index.html" rel="noreferrer">FOSUserBundle</a>. And I got stuck at step 5 mentioned in this article. When it says:</p>
  
  <blockquote>
    <p>Add the following configuration to your config.yml file according to
    which type of datastore you are using.</p>
  </blockquote>
  
  <pre><code># app/config/config.yml
  fos_user:
      db_driver: orm # other valid values are 'mongodb' and 'couchdb'
      firewall_name: main
      user_class: AppBundle\Entity\User
      from_email:
          address: "%mailer_user%"
          sender_name: "%mailer_user%"
  </code></pre>
  
  <p>The problem is that in symfony4, there is no <code>app</code> folder, and no simple <code>config.yml</code> file in config folder.</p>
  
  <p>I think this article might be working with older versions, but for Symfony4, it may need some amendments. </p>
  
  <p>Can any body suggest how to fix it?</p>