message: add section to README for feature requests
diff: Welcome to the apache-airflow plugin!
  +## Feature Requests & Ideas
  +
  +- [ ] Add support for running multiple instances of Airflow for monitoring
  + various deployment stages or business domains. ([Suggested by @JGoldman110](https://github.com/backstage/backstage/issues/735#issuecomment-985063468))
  +- [ ] Make owner chips in the DAG table clickable, resolving to a user or group
  + in the entity catalog. ([Suggested by @julioz](https://github.com/backstage/backstage/pull/8348#discussion_r764766295))
  +
  ## Installation
  1. Install the plugin with `yarn` in the root of your Backstage directory
  