Update readme file & sample config file

README.md

@@ -1,6 +1,50 @@
-godns
-=====
+## GoDNS
 
-[![Build Status](https://drone.io/github.com/TimothyYe/godns/status.png)](https://drone.io/github.com/TimothyYe/godns/latest)
+[![Build Status](https://travis-ci.org/TimothyYe/godns.svg?branch=master)](https://travis-ci.org/TimothyYe/godns)
 
-A dynamic DNS tool, based on dnspod, written by Golang.
+GoDNS is a dynamic DNS (DDNS) tool, it is based on my early open source project: [DynDNS](https://github.com/TimothyYe/DynDNS). 
+
+Now I rewrite [DynDNS](https://github.com/TimothyYe/DynDNS) by Golang and call it [GoDNS](https://github.com/TimothyYe/godns).
+
+## Pre-condition
+
+GoDNS is relied to [DNSPod](http://dnspod.cn) and its API. 
+
+To use GoDNS, you need to have a domain and host it on [DNSPod](http://dnspod.cn).
+
+## Build it
+
+### Get & build it from source code
+
+* Get source code from Github:
+
+```bash
+git clone https://github.com/TimothyYe/godns.git
+```
+* Go into the godns directory, get related library and then build it:
+
+```bash
+cd godns
+go get
+go build
+```
+* Then you get GoDNS.
+
+### Build godns from the 3rd party 
+
+* Visit this URL provided by [GoBuild](http://gobuild.io/download/github.com/TimothyYe/godns).
+* Select the platform you need.
+* Input the build type and branch name.
+* Build and download GoDNS.
+
+## Run it
+
+* Get [config_sample.json](https://github.com/TimothyYe/godns/blob/master/config_sample.json) from Github.
+* Rename it to **config.json**.
+* Configure your domain/sub-domain info, username and password of DNSPod account.
+* Save it in the same directory of GoDNS.
+* The last step, run godns:
+```bash
+nohup ./godns &
+```
+* Enjoy it!

config_sample.json

@@ -3,5 +3,5 @@
 	"password": "",
 	"domain": "",
 	"sub_domain": "",
-	"ip_url": ""
+	"ip_url": "http://members.3322.org/dyndns/getip"
 }