Add link to react-cosmos-redux

Author: ovidiuch

NEXT.md

@@ -108,6 +108,10 @@ export default ({ children }) => <Provider store={store}>{children}</Provider>;
 
 Here's a [basic Redux decorator example](https://github.com/skidding/flatris/blob/b87634a69feb9baf8347e90cdf034704e457e88c/web/components/FlatrisGame/cosmos.decorator.js#L24-L30).
 
+### Redux state mock
+
+Check out [react-cosmos-redux](https://github.com/skidding/react-cosmos-redux) if you'd like to see what a Cosmos Next decorator looks like. It works with the latest `react-redux` version and it's written with _hooks_ 💃.
+
 ## UI plugins
 
 A main feature of the Cosmos Next redesign is the brand-new UI plugin architecture. While the new UI is created 100% from plugins, the plugin API is not yet documented. This is the next step.