Update README.md

Author: piashcse

README.md

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 # React Native Movie App
 ![badge-Android](https://img.shields.io/badge/Platform-Android-brightgreen)
 ![badge-iOS](https://img.shields.io/badge/Platform-iOS-lightgray)
+[![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 <a href="https://github.com/piashcse"><img alt="License" src="https://img.shields.io/static/v1?label=GitHub&message=piashcse&color=C51162"/></a>
 
 Movie App using [The Movie DB](https://www.themoviedb.org) and build with react-native and redux based architecture<br>