Readme Badges added

Author: turleo

README.md

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+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://github.com/BM835/PowerButton/blob/master/LICENSE)[![Release](https://img.shields.io/github/release/bm835/PowerButton.svg?style=flat)](https://github.com/bm835/PowerButton/releases)![Repo size](https://img.shields.io/github/repo-size/bm835/PowerButton.svg?style=flat)
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 # PowerButton
 Turn off device screen without clicking the hardware button