Update README.md

Author: apady

README.md

@@ -1,8 +1,18 @@
 # BFS-PHP-SDK
 PHP SDK for Baidu File System
 
+## Installation
+```
+composer require apady/bfs-php-sdk
+```
+
 ## Dependency
 BFS SDK now offers `C/C++` API, as a result, using `BFS-PHP-SDK` resquires a [BFS PHP EXTENSION](https://github.com/apady/bfs-php-extension) as fundamental support.
 
+## 安装
+```
+composer require apady/bfs-php-sdk
+```
 ## 依赖
 由于BFS SDK 只提供 `C/C++` API，使用`BFS-PHP-SDK` 需要有 [BFS PHP 扩展](https://github.com/apady/bfs-php-extension) 作为底层支持
+