update readme. add some badges

Author: inhere

README.md

@@ -1,5 +1,17 @@
-# system utils for php
+# system utils
 
-## license
+[![License](https://img.shields.io/packagist/l/php-toolkit/sys-utils.svg?style=flat-square)](LICENSE)
+[![Php Version](https://img.shields.io/badge/php-%3E=7.1.0-brightgreen.svg?maxAge=2592000)](https://packagist.org/packages/php-toolkit/sys-utils)
+[![Latest Stable Version](http://img.shields.io/packagist/v/php-toolkit/sys-utils.svg)](https://packagist.org/packages/php-toolkit/sys-utils)
+
+Some useful system utils for php
+
+## Install
+
+```bash
+composer require toolkit/sys-utils
+```
+
+## License
 
 MIT