use gopm as get & build tool

README.md

@@ -50,6 +50,12 @@ Drivers for Go's sql package which currently support database/sql includes:
 
 # Installation
 
+If you have [gopm](https://github.com/gpmgo/gopm) installed, 
+
+	gopm get github.com/lunny/xorm
+	
+Or
+
 	go get github.com/lunny/xorm
 
 # Documents

README_CN.md

@@ -50,6 +50,12 @@ xorm是一个简单而强大的Go语言ORM库. 通过它可以使数据库操作
 
 ## 安装
 
+推荐使用 [gopm](https://github.com/gpmgo/gopm) 进行安装： 
+
+	gopm get github.com/lunny/xorm
+	
+或者您也可以使用go工具进行安装：
+
 	go get github.com/lunny/xorm
 
 ## 文档