doc: Update README.md

Author: jaywcjlove

core/README.md

@@ -26,6 +26,12 @@ A React component for displaying and editing javascript arrays and JSON objects.
 ✏️ Support editing and adding features  
 ♻️ Whether to highlight updates.
 
+The new version **[v2](https://github.com/uiwjs/react-json-view/tree/v2)** has redesigned the API to make the code more maintainable and introduced a simpler and more flexible component customization rendering API. Each component can now have custom rendering, and the new API resembles React more closely.
+
+- [x] Complete all features of displaying JSON in v1.
+- [ ] Add editing functionality to v2.
+- [ ] Add test cases to v2.
+
 ## Quick Start
 
 ```bash