add an example

README.md

@@ -20,5 +20,39 @@ SOCKS is a SOCKS4, SOCKS4A and SOCKS5 proxy package for Go.
     tr := &http.Transport{Dial: dialSocksProxy}
     httpClient := &http.Client{Transport: tr}
 
+## Example
+
+```go
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+
+	"h12.me/socks"
+)
+
+func main() {
+	dialSocksProxy := socks.DialSocksProxy(socks.SOCKS5, "127.0.0.1:1080")
+	tr := &http.Transport{Dial: dialSocksProxy}
+	httpClient := &http.Client{Transport: tr}
+	resp, err := httpClient.Get("http://www.google.com")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		log.Fatal(resp.StatusCode)
+	}
+	buf, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(buf))
+}
+```
+
 ## Alternatives
 http://godoc.org/golang.org/x/net/proxy