add CONTRIBUTING.md #14

CONTRIBUTING.md

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+欢迎贡献
+====================
+
+- :see_no_evil: [自己](http://weibo.com/oldratlee)理解粗浅，翻译中不足和不对之处，欢迎 :clap:
+    - 建议，[提交`Issue`](https://github.com/oldratlee/translations/issues/new)
+    - 指正，[`Fork`后提通过`Pull Requst`贡献修改](https://github.com/oldratlee/translations/fork)
+- 如有文章理解上有疑问 或是 使用过程中碰到些疑惑，请随意:raised_hands:[提交`Issue`](https://github.com/oldratlee/translations/issues/new) ，一起学习交流讨论！
+
+贡献你的修改请注意
+-----------------
+
+好的排版可以突出重点，也方便阅读/编辑。
+
+### 对于英文术语，请用代码块引用
+
+格式：\`Unix\`，效果：`Unix`。
+这样的等宽样式即可以突出术语重点，也过很优美。
+
+### 自成一段的代码，要加上代码语法染色
+
+语法染色方便阅读。
+
+格式：
+
+    ```c
+    #include<stdio.h>
+
+    int main(int argc, char *argv[])
+    {
+        puts("Hello World");
+        return 0;
+    }
+    ```
+
+效果：
+
+```c
+#include<stdio.h>
+
+int main(int argc, char *argv[])
+{
+    puts("Hello World");
+    return 0;
+}
+```
+
+### 一号/二号标题使用下划风格
+
+方便编辑时迅速识别。
+
+格式：
+
+    HEAD 1
+    =====================
+    
+    HEAD 2
+    ---------------------
+
+### 对于过长行，请换行
+
+这样方便编辑。
+
+    “For a long time it puzzled me how something so expensive, so leading edge, could be so useless.
+    And then it occurred to me that a computer is a stupid machine with the ability to do incredibly smart things,
+    while computer programmers are smart people with the ability to do incredibly stupid things.
+    They are, in short, a perfect match.”
+    
+    — Bill Bryson
+
+因为在`Markdown`换行是不分段的（通过空行分段），所以不影响显示效果。上面内容显示效果如下：
+
+“For a long time it puzzled me how something so expensive, so leading edge, could be so useless.
+And then it occurred to me that a computer is a stupid machine with the ability to do incredibly smart things,
+while computer programmers are smart people with the ability to do incredibly stupid things.
+They are, in short, a perfect match.”
+
+— Bill Bryson