[Ann] Phoedown an FFI to hoedown

Hi all,

I've published Phoedown, an FFI to hoedown, the standards compliant, fast, secure Markdown
processing library written in C. 

- https://github.com/PierceNg/Phoedown
- https://github.com/hoedown/hoedown

A simple example:

    | md |
    md := (FileSystem memory / 'somefile.md')
    	writeStreamDo: [ :ws |
    		ws nextPutAll: 
    Transcript show: ''Happy New Year!''; cr
    ' ];
    HdHtmlRenderer new
    	setMarkdownExtension: HdMarkdownExtensions FencedCode;
    	setMarkdownExtension: HdMarkdownExtensions NoIntraEmphasis;
    	render: md

This is the output:

    <pre><code class="language-smalltalk">Transcript show: 'Happy New Year!'; cr
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