Markdown 是一种轻量级纯文本格式语法的修饰语言，可以轻松转换成 HTML 和其他很多种格式。Markdown常用于格式化 readme 文件，在网络论坛中编辑消息，以及使用纯文本编辑器创建富文本内容。由于Markdown的初步描述包含含糊不清和未解答的问题，所以多年来，Markdown出现了许多实现和扩展来回答这些问题
> Markdown is a lightweight markup language with plain text formatting syntax. It is designed so that it can be converted to HTML and many other formats using a tool by the same name.[8] Markdown is often used to format readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor. As the initial description of Markdown contained ambiguities and unanswered questions, many implementations and extensions of Markdown appeared over the years to answer these issues.
