docs: add notice

README.md

@@ -2,6 +2,10 @@
 
 In App Purchase module in Expo
 
+# Notice
+
+The `expo-iap` module has been migrated from [react-native-iap](https://github.com/dooboolab/react-native-iap). Moving forward, the `react-native-iap` repository will gradually be deprecated, and `expo-iap` will become the actively maintained module. Please take note of this transition. For more details, refer to the [Future Roadmap and Discussion in react-native-iap](https://github.com/dooboolab-community/react-native-iap/discussions/2754). Additionally, you can check the [Current Project Status comment](https://github.com/dooboolab-community/react-native-iap/discussions/2754#discussioncomment-10510249) to stay updated on the project's progress.
+
 # API documentation
 
 - [Documentation for the main branch](https://github.com/expo/expo/blob/main/docs/pages/versions/unversioned/sdk/iap.md)