* update README.md

Author: zhouyl

README.md

@@ -2,10 +2,45 @@
 
 ## Installation
 
+### Via Composer
+
+```bash
+composer require zhouyl/phpfmt-tool
+```
+
+### Configuration file lookup order
+
+1. $PWD/.phpfmt.ini (customize)
+2. $HOME/.phpfmt/.phpfmt.ini (global)
+
+### Customize the configuration file
+
+```bash
+cp vendor/zhouyl/phpfmt-tool/.phpfmt.ini .
+```
+
+### Customize the default formatting directories (e.g. laravel 5.x)
+
+```bash
+echo "./app ./bootstrap ./database" > ./.fmtdirs
 ```
+
+### Usage
+
+```bash
+cd /workspace/myapplication
+vendor/bin/phpfmt .
+```
+
+## Global Installation
+
+```bash
 wget --no-check-certificate https://github.com/zhouyl/phpfmt-tool/raw/master/phpfmt -O /usr/local/bin/phpfmt
 chmod +x /usr/local/bin/phpfmt
+cd /workspace/myaplication
+phpfmt .
 ```
 
-## Usage
+## License
 
+The MIT License (MIT). Please see [License File](LICENSE) for more information.