message: Update README.md
  This is needed, otherwise, after you're redirected back there is an error from browser and nothing works.
diff: @@ -160,6 +160,18 @@ by this plugin.
  Grab a copy of [oauth2-redirect.html](https://github.com/swagger-api/swagger-ui/blob/master/dist/oauth2-redirect.html)
  and put it in the `app/public/` directory in order to enable Swagger UI to complete this redirection.
  +This also may require you to adjust `Content Security Policy` header settings of your backstage application. So javascript on `oauth2-redirect.html` can be executed.
  +
  +There are two steps:
  +1. Open `oauth2-redirect.html` for editing and add `nonce` to the `script` tag. Like this
  + ```
  + <script nonce="oauth2-redirect">
  + ```
  +2. Now adjust backstage configuration, `backend.csp` section and add there new property:
  + ```
  + script-src: ["'self'", "'nonce-oauth2-redirect'", "'unsafe-eval'"]
  + ```
  +
  #### Configuring your OAuth2 Client
  You'll need to make sure your OAuth2 client has been registered in your OAuth2 Authentication Server (AS)
  