message: model-server docs tweak
diff: @@ -14,6 +14,14 @@ npm install
  Customize configuration at ``src/server/model/config.ts`` to point to your data and which custom properties to include (see the [Custom Properties](#custom-properties) section). Alternatively, the config can be edited in the compiled version in ``build/node_modules/servers/model/config.js``.
  +Afterwards, build the project:
  +
  +```
  +npm run build
  +```
  +
  +(or run watch mode for automatic rebuilds: ``npm run watch``)
  +
  Running the server locally for testing:
  ```
  npm run model-server
  