message: Add instructions for using the gallery server in the README
diff: @@ -20,6 +20,16 @@ To run the Outline Manager as a web app on the browser and listen for changes:
  yarn do server_manager/web_app/run
  ```
  +## Gallery Server for UI Development
  +
  +We have a server app to for quickly iterating on UI components. To spin it up, run
  +
  +```
  +yarn do server_manager/web_app/run_gallery
  +```
  +
  +Changes to UI components will be hot reloaded into the gallery.
  +
  ## Debug an existing binary
  You can run an existing binary in debug mode by setting `OUTLINE_DEBUG=true`.
  