Adding Markdown to Ddoc

[Walter Bright]

On 12/6/2017 1:33 AM, Sönke Ludwig wrote:
> This is great news! While I don't have the time to work on this directly, I can 
> offer vibe.d's Markdown module* (re-licensing as necessary): 
> https://github.com/vibe-d/vibe.d/blob/master/textfilter/vibe/textfilter/markdown.d
> 
> Markdown is a strange thing to parse in the classical way due to its original 
> regex-cascade style of implementation/design, so it was kind of difficult to 
> find representations that allow reasonably efficient and comprehensible processing.
> 
> * There is also "dmarkdown", which is just a fork of the vibe.d code

Thanks! It's always great to be able to leverage existing code. But you'll need 
to Boost license it!