update docs

-## beego orm
+# beego orm
 
 a powerful orm framework
 
 now, beta, unstable, may be changing some api make your app build failed.
 
+**Driver Support:**
+
+* MySQL: [github.com/go-sql-driver/mysql](https://github.com/go-sql-driver/mysql)
+
+**Features:**
+
+...
+
+**Install:**
+
+	go get github.com/astaxie/beego/orm
+
+## Quick Start
+
+#### Simple Usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/astaxie/beego/orm"
+	_ "github.com/go-sql-driver/mysql" // import your used driver
+)
+
+// Model Struct
+type User struct {
+	Id   int    `orm:"auto"`
+	Name string `orm:"size(100)"`
+	orm.Manager
+}
+
+func init() {
+	// register model
+	orm.RegisterModel(new(User))
+
+	// set default database
+	orm.RegisterDataBase("default", "mysql", "root:root@/my_db?charset=utf8", 30)
+}
+
+func main() {
+	o := orm.NewOrm()
+
+	user := User{Name: "slene"}
+
+	// insert
+	id, err := o.Insert(&user)
+
+	// update
+	user.Name = "astaxie"
+	num, err := o.Update(&user)
+
+	// read one
+	u := User{Id: user.Id}
+	err = o.Read(&u)
+
+	// delete
+	num, err = o.Delete(&u)	
+}
+```
+
+#### Next with relation
+
+```go
+type Post struct {
+	Id    int    `orm:"auto"`
+	Title string `orm:"size(100)"`
+	User  *User  `orm:"rel(fk)"`
+	orm.Manager
+}
+
+var posts []*Post
+qs := o.QueryTable("post")
+num, err := qs.Filter("User__Name", "slene").All(&posts)
+```
+
+#### Use Raw sql
+
+```go
+var maps []Params
+num, err := o.Raw("SELECT id FROM user WHERE name = ?", "slene").Values(&maps)
+if num > 0 {
+	fmt.Println(maps[0]["id"])
+}
+```
+
+#### Transaction
+
+```go
+o.Begin()
+...
+user := User{Name: "slene"}
+id, err := o.Insert(&user)
+if err != nil {
+	o.Commit()
+} else {
+	o.Rollback()
+}
+
+```
+
+## Docs
+
+more details and examples in docs and test
+
+* [中文](docs/zh)
+* English
+
 ## TODO
 - some unrealized api
 - examples
 - docs
+- support sqlite
 - support postgres
-- support sqlite
\ No newline at end of file
+
+## 

-## beego orm 介绍
-
-## 快速入门
-
-```go
-package main
-
-import (
-	"fmt"
-	"github.com/astaxie/beego/orm"
-	_ "github.com/go-sql-driver/mysql"
-)
-
-// 最简单的两个表的定义
-type User struct {
-	Id   int    `orm:"auto"`
-	Name string `orm:"size(100)"`
-	orm.Manager
-}
-
-func init() {
-	// 将表定义注册到 orm 里
-	orm.RegisterModel(new(User))
-
-	// 链接参数设置
-	orm.RegisterDataBase("default", "mysql", "root:root@/my_db?charset=utf8", 30)
-}
-
-func main() {
-	o := orm.NewOrm()
-
-	user := User{Name: "slene"}
-
-	// 创建
-	id, err := o.Insert(&user)
-	fmt.Println(id, err)
-
-	// 更新
-	user.Name = "astaxie"
-	num, err := o.Update(&user)
-	fmt.Println(num, err)
-
-	// 查询单个
-	u := User{Id: user.Id}
-	err = o.Read(&u)
-	fmt.Println(u.Name, err)
-
-	// 删除
-	num, err = o.Delete(&u)
-	fmt.Println(num, err)
-}
-```
-
-## 详细文档
+## 文档目录
 
 1. [模型定义](Models.md)
-	- [支持的 Field 类型](Models.md#Field Type)
-	- [Field 设置参数](Models.md#Field Options)
-	- [关系型 Field 设置](Models.md#Relation Field Options)
+	- [支持的 Field 类型](Models.md#field-type)
+	- [Field 设置参数](Models.md#field-options)
+	- [关系型 Field 设置](Models.md#relation-field-options)
 2. Custom Fields
 3. [Orm 使用方法](Orm.md)
 	- [Ormer 接口](Orm.md#Ormer)