Add admin user and solve email format

app/build.sh

@@ -6,7 +6,7 @@ pip install -r requirements.txt
 
 # How to automate createsuperuser on django
 # https://stackoverflow.com/questions/6244382/how-to-automate-createsuperuser-on-django/59467533#59467533
-python manage.py shell -c "from django.contrib.auth import get_user_model; get_user_model().objects.create_user('admin', 'todoapp19573')"
+python manage.py shell -c "from django.contrib.auth import get_user_model; get_user_model().objects.create_user('admin@todo.com', 'todoapp19573')"
 python manage.py collectstatic --no-input
 python manage.py migrate