message: Adds default username and password created at installation to documentation
diff: @@ -70,7 +70,10 @@ initialize development environment: ::
  docker-compose up
  After several minutes for superset initialization to finish, you can open
  -a browser and view `http://localhost:8088` to start your journey.
  +a browser and view `http://localhost:8088` to start your journey. By default
  +the system configures an admin user with the username of `admin` and a password
  +of `admin` - if you are in a non-local environment it is highly recommended to
  +change this username and password at your earliest convenience.
  From there, the container server will reload on modification of the superset python
  and javascript source code.
  