update readme. add some badges

Author: inhere

README.md

@@ -1,11 +1,22 @@
-# file utils for php
+# file utils
+
+[![License](https://img.shields.io/packagist/l/php-toolkit/file-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/file-utils)
+[![Latest Stable Version](http://img.shields.io/packagist/v/php-toolkit/file-utils.svg)](https://packagist.org/packages/php-toolkit/file-utils)
+
+Some useful filesystem utils for php
 
 - basic filesystem operation
 - file read/write operation
 - directory operation
 - file finder
 
+## Install
+
+```bash
+composer require toolkit/file-utils
+```
 
-## license
+## License
 
 MIT