docs: add Lean Core badge

README.md

@@ -1,9 +1,10 @@
 # react-native-status-bar
 
-[![npm package](https://img.shields.io/npm/v/@react-native-community/status-bar.svg)](https://www.npmjs.org/package/@react-native-community/status-bar)
-[![CircleCI Status](https://img.shields.io/circleci/project/github/react-native-community/react-native-statusbar/master.svg)](https://circleci.com/gh/react-native-community/workflows/react-native-netinfo/tree/master) ![Supports Android and iOS](https://img.shields.io/badge/platforms-android%20|%20ios-lightgrey.svg) 
-![MIT License](https://img.shields.io/npm/l/@react-native-community/status-bar.svg)
+[![npm package](https://img.shields.io/npm/v/@react-native-community/status-bar.svg?style=flat-square)](https://www.npmjs.org/package/@react-native-community/status-bar)
+[![CircleCI Status](https://img.shields.io/circleci/project/github/react-native-community/react-native-statusbar/master.svg?style=flat-square)](https://circleci.com/gh/react-native-community/workflows/react-native-netinfo/tree/master) ![Supports Android and iOS](https://img.shields.io/badge/platforms-android%20|%20ios-lightgrey.svg) 
+![MIT License](https://img.shields.io/npm/l/@react-native-community/status-bar.svg?style=flat-square)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
+[![Lean Core Extracted](https://img.shields.io/badge/Lean%20Core-Extracted-brightgreen.svg?style=flat-square)][lean-core-issue]
 
 ## Getting started
 
@@ -283,3 +284,4 @@ Status bar animation
 | fade  | Fade animation  |
 | slide | Slide animation |
 
+[lean-core-issue]:https://github.com/facebook/react-native/issues/23313