message: Clarify contributing
diff: @@ -42,6 +42,13 @@ this process in [Create an app](./create-an-app.md).
  ### Contributing to Backstage
  +If you intend to make changes to the core project's packages, certain plugins,
  +or project documentation, then you can fork and clone
  +[https://github.com/backstage/backstage](https://github.com/backstage/backstage).
  +
  +This will let you run the latest code off of the `master` branch, fix bugs or
  +contribute new features, run test suites, etc.
  +
  You can read more in our
  [CONTRIBUTING](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md)
  guide, which can help you get setup with a Backstage development environment.
  