Hello, I introduced a Markdown export back-end in contrib/. It uses atx syntax for headlines and inline syntax for links and images. It is quite simple, so don't expect much about it.
This is Markdown vanilla flavour, so there are a few thing that it doesn't support. Among them, some are simply ignored (i.e. footnotes), other are sent to HTML back-end (i.e. tables). Anyway, creating a new flavour out of it (i.e. Github Markdown Flavour) is simple with `org-export-define-derived-backend'. You can use `org-md-export-as-markdown' and `org-md-export-to-markdown' functions to test it. Feedback is welcome (note: I don't use md format, so for suggestions, please be explicit). Regards, -- Nicolas Goaziou
