message: docs: Describe default server in readme
diff: @@ -39,6 +39,9 @@ npm ci
  npm start
  ```
  +This will start up a server running on port 3000 with a backend storing all data in memory.
  +More configs with different backends can be found in the config folder.
  +
  ## Interacting with the server
  The server supports low-level interaction via HTTP methods,
  