Create CONTRIBUTING.md

CONTRIBUTING.md

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+How to contribute
+=================
+
+Before you submit issues, please take a few minutes to read this guide.
+
+在你提交问题前，请花两分钟阅读一下这份指南。
+
+Issues
+------
+
+Please include the following information in your submission:
+
+1. How did you set up your environment? (OS, version of Shadowsocks)
+2. Where did you see this error, was it on local or on server?
+3. What happened in your browser? Just no response, or any error message?
+4. 10 lines of log on the local side of shadowsocks when the error happened.
+5. 10 lines of log on the server side of shadowsocks when the error happened.
+6. Any other useful information.
+
+Skip any of them if you don't know its meaning.
+
+问题反馈
+-------
+
+请提交下面的信息：
+
+1. 你是如何搭建环境的？（操作系统，Shadowsocks 版本）
+2. 错误是发生在哪里，本地还是服务器？
+3. 浏览器里的现象是什么？一直转菊花，还是有提示错误？
+4. 发生错误时，本地端的十行完整的日志。
+5. 发生错误时，服务器端的十行完整的日志。
+6. 其它你认为可能和问题有关的信息。
+
+如果你不清楚其中某条的含义， 可以直接跳过那一条。