Update README.rst

New User. No database installed yet and the Welcome page does not require a database to demonstrate the server is working and links work etc. I anticipate setting up SQLAlchemy is the next step.

{{cookiecutter.app_name}}/README.rst

@@ -23,6 +23,11 @@ Then run the following commands to bootstrap your environment.
     git clone https://github.com/{{cookiecutter.github_username}}/{{ cookiecutter.app_name }}
     cd {{cookiecutter.app_name}}
     pip install -r requirements/dev.txt
+    python manage.py server
+    
+You will see a pretty Welcome screen.
+If you have already installed your database.
+
     python manage.py db init
     python manage.py db migrate
     python manage.py db upgrade