message: docs: update getting started with create-app
diff: @@ -15,7 +15,13 @@ To create a Backstage app, you will need to have
  [NodeJS](https://nodejs.org/en/download/) Active LTS Release installed
  (currently v12).
  -With `npx`:
  +Backstage provides a utility for creating new apps. It guides you through the
  +initial setup of selecting the name of the app and a database for the backend.
  +The database options are either SQLite or PostgreSQL, where the latter requires
  +you to set up a separate database instance. If in doubt, choose SQLite, but
  +don't worry about the choice, it's easy to change later!
  +
  +The easiest way to run the create app package is with `npx`:
  ```bash
  npx @backstage/create-app
  