[D] Update Contributing doc

CONTRIBUTING.md

@@ -140,6 +140,12 @@ For Windows, Yarn could be find at [Classic YarnPkg](https://classic.yarnpkg.com
   * usage: `<CapDownQuote messages={string[][]} />`
     * messages: `string[][]`, the message of quote block.
   * example: `<blockquote><CapDownQuote messages={[["你走了呀……姊姊……”", "“这个天线的馈线那些怎么看来着？”"], ["“不上学了嘛……”", "“不是说好了下一次……”"], ["“山猫猫！抱住~”", "“她听力不太好哦……”"], ["“为什么……”", "“把我们丢在这……”"], ["“这是为了她……”", "“下一次一起打mai……”"], ["“教我开车嘛~”", "“帮我照顾好山猫猫~“"], ["“姊姊好厉害，好羡慕……”", "“又被家里人说了，公司的工作也很多……”"]]} /></blockquote>`
+* `TextRing`
+  * usage: `<TextRing text="" />`
+    * text: `string`, the text you want display
+* `DottedNumber`
+  * usage: `<DottedNumber n="" />` OR `<DottedNumber n={number}`
+    * n: `string|number`, the number you want to display.
 
 ## 6. Punctuations