message: docs: Mention developer notes
diff: @@ -26,6 +26,10 @@ and check how it is made.
  The [architectural diagram](https://github.com/RubenVerborgh/solid-server-architecture)
  can help you find your way.
  +If you are interested in helping out with the development of this server,
  +be sure to have a look at the [developer notes](https://github.com/solid/community-server/wiki/Notes-for-developers)
  +and [good first issues](https://github.com/solid/community-server/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22).
  +
  ## Running locally
  ```
  