Xcode playground markdown常用语法

Markdown 语法说明

//: **Bold** *Italic*
/*:

 # h1
 ## h2
 ### h3
 #### h4 h5 h6 same as h3
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 * blank seperate lines below
 ******
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 * unordered list
 - unordered list
 + unordered list
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 1. ordered list
 2. ordered list
 3. ordered list
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 [baidu link](https://www.baidu.com)

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 > first level quoting
 > > nested blockquote
 > > > nested level quoting
 > > > * use list in quote
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 ![img](MFR_playground.png)

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