chore: add resource under flutter:state-management:riverpod

src/data/roadmaps/flutter/content/111-state-management/102-riverpod.md

@@ -10,3 +10,4 @@ Learn more from the following links:
 - [Riverpod in Flutter](https://docs.flutter.dev/development/data-and-backend/state-mgmt/options#riverpod)
 - [Documentation](https://riverpod.dev/)
 - [Documentation v2 is in progress](https://docs-v2.riverpod.dev/)
+- [Flutter Riverpod 2.0: The Ultimate Guide](https://codewithandrea.com/articles/flutter-state-management-riverpod/)