Update readme

Author: pcastornii

README.md

@@ -217,6 +217,9 @@ in business terms — exposing properties like `orderValid` or `documentDirty` 
 UI state as the responsibility of the `View`. Both approaches are valid, but they imply different distributions of
 responsibility between the `View` and the `ViewModel`.
 
+To simplify working with the `ViewModel`, you can use the [StateFX](https://github.com/techsenger/statefx)
+library, which allows creating JavaFX node states through composition using interfaces.
+
 `Model` — represents the application’s data and business logic. As in other patterns, the `Model` is completely
 independent of the UI and does not reference either the `View` or the `Presenter`.