message: docs(proxy): add link to plugin creation docs
diff: @@ -95,4 +95,13 @@ There are two things needed for a Backstage app to start making use of a plugin.
  Luckily these two steps happen automatically when you create a plugin with the
  Backstage CLI.
  +## Talking to the outside world
  +
  +If your plugin needs to communicate with services outside the backstage
  +environment you will probably face challenges like CORS policies and/or
  +backend-side authorization. To smooth this process out you can use proxy -
  +either the one you already have (like nginx/haproxy/etc) or the proxy-backend
  +plugin that we provide for the backstage backend.
  +[Read more](../../plugins/proxy-backend/README.md)
  +
  [Back to Getting Started](README.md)
  