Add contribute-translation.md

contribute-translation.md

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+# 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!