Adding Markdown to Ddoc

[John Gabriele]

On Wednesday, 6 December 2017 at 04:11:33 UTC, Walter Bright 
wrote:
> https://help.github.com/articles/basic-writing-and-formatting-syntax/
>
> Anyone interested in picking up the flag?
>
> (I know this has come up before, and I've been opposed to it, 
> but I've changed my mind.)

Great to hear this! :)

[Pandoc](http://pandoc.org/) is an excellent widely-used markdown 
implementation to emulate (or use directly); they support 
thoughtful additional syntax for definition lists, tables, 
mathematics, and a few other niceties (including syntax 
highlighting for D code blocks).