Update README.md

README.md

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 # react-native-fetch-blob [![release](https://img.shields.io/github/release/wkh237/react-native-fetch-blob.svg?maxAge=86400&style=flat-square)](https://www.npmjs.com/package/react-native-fetch-blob) [![npm](https://img.shields.io/npm/v/react-native-fetch-blob.svg?style=flat-square)](https://www.npmjs.com/package/react-native-fetch-blob) ![](https://img.shields.io/badge/PR-Welcome-brightgreen.svg?style=flat-square) [![npm](https://img.shields.io/npm/l/react-native-fetch-blob.svg?maxAge=2592000&style=flat-square)]() 
 
-A project committed to make file acess and transfer easier and effiecient for React Native developers. Supports file, Asset files, and CameraRoll files.
+A project committed to make file acess and transfer easier and effiecient for React Native developers. 
+
+## Features
+- Transfer data directly from/to storage without BASE64 bridging
+- File API supports normal files, Asset files, and CameraRoll files
+- Native-to-native file manipulation, reduce JS bridging performance loss
+- Blob, File, XMLHttpRequest polyfills that make browser-based library available in RN
 
 ## TOC
 * [About](#user-content-about)