Add contribute-translation.md

Author: StageGuard

README.md

@@ -140,7 +140,9 @@ files.removeDir("/storage/emulated/0/Documents/SkyAutoPlayer/");
 
 # 贡献
 
-欢迎任何人贡献本项目，包括但不限于Pull Request，Issue，New feature request
+欢迎任何人贡献本项目，包括但不限于Pull Request，Issue，New feature request 或者 贡献翻译。
+
+
 
 ## 贡献者名单(按照首次贡献时间排序)
 
@@ -171,6 +173,16 @@ Twitter[Phoebe@huunhut1217](https://mobile.twitter.com/huunhut1217)<br>
 酷安[@头条乀](http://www.coolapk.com/u/1192320)<br>
 <br>
 
+## 翻译
+
+SkyAutoplayerScript 在版本 21 已支持多语言并可以在线获取语言列表，你可以查看 [contribute-translation.md](contribute-translation.md) (English) 来了解如何贡献翻译。
+
+SkyAutoplayerScript version 21 has supported multi-language and can also fetch online language list, follow [contribute-translation.md](contribute-translation.md) (English) guide to contribute translation.
+
+### 贡献者：
+
+无
+
 # 图标来源
 
 [Iconfont-阿里巴巴矢量图标库](https://www.iconfont.cn/)

contribute-translation.md

@@ -0,0 +1,30 @@
+# Help to translate SkyAutoplayerScript
+
+Follow [Issue#4](https://github.com/StageGuard/SkyAutoPlayerScript/issues/4) request, SkyAutoplayerScript has updated version 21, which supported multi-language.
+
+It can also fetch online language list [source/language_list.json](https://github.com/StageGuard/SkyAutoPlayerScript/blob/master/source/language_list.json). So if you want to translate SkyAutoplayerScript into another language, please follow the steps below.
+
+- Clone this repository.
+- Create a new file in **resources/language_pack/xx_XX.json**, the file name must be standard language code (e.g. zh_CN or en_US).
+- You can refer to **resources/language_pack/en_US.json** to translate.
+- Modify **source/language_list.json**: 
+
+```js
+{
+    "list": [{
+        "code": "", //your language code
+        "name": "" //language name
+    }, {
+        "code": "zh_CN",
+        "name": "简体中文"
+    }, {
+        //...
+    }]
+}
+```
+
+- Create a new pull request.
+
+After merging, your language will be shown in Setting-Language list.
+
+I would appreciate it if you could contribute translation!