Adding Javascript validation to your own forms is extremely simple. First, you need to create a Form (form.js) object to represent your form.
Acknowledge to the Original Poster.
php symfony/data/bin/symfony generate:project PROJECT_NAME --orm=Propel
php symfony configure:database "mysql:host=localhost;dbname=DB_NAME" DB_USER DB_PASS
php symfony generate:app frontend
symfony propel:generate-module --with-show --non-verbose-templates frontend registration Registration