message: docs: added instructions for running backend to getting started
diff: @@ -80,3 +80,12 @@ yarn start
  _When `yarn start` is ready it should open up a browser window displaying your
  app, if not you can navigate to `http://localhost:3000`._
  +
  +In most cases you will want to start the backend as well, as it is required for
  +the catalog to work, along with many other plugins.
  +
  +To start the backend, open a separate terminal session and run the following:
  +
  +```bash
  +yarn --cwd packages/backend start
  +```
  