docs: add README

Author: hurali97

README.md

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+
+### About
+
+This is an Android App which is used in demoing the brownfield integration using callstack's [guide](https://www.callstack.com/ebooks/incremental-react-native-adoption-in-native-apps) and React Native Enterprise Framework [here](https://www.rnef.dev/docs/brownfield/android).
+
+![Video](assets/app_recording.gif)