Improve document for #742

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -374,8 +374,41 @@ func main() {
 }
 ```
 
+#### Bind Query String
+
+See the [detail information](https://github.com/gin-gonic/gin/issues/742#issuecomment-264681292).
+
+```go
+package main
+
+import "log"
+import "github.com/gin-gonic/gin"
+
+type Person struct {
+	Name    string `form:"name"`
+	Address string `form:"address"`
+}
+
+func main() {
+	route := gin.Default()
+	route.GET("/testing", startPage)
+	route.Run(":8085")
+}
+
+func startPage(c *gin.Context) {
+	var person Person
+	if c.Bind(&person) == nil {
+		log.Println(person.Name)
+		log.Println(person.Address)
+	}
+
+	c.String(200, "Success")
+}
+```
+
 
 ### Multipart/Urlencoded binding
+
 ```go
 package main