Add markdown into a document object
The markdown definition used is John Gruber documented here: http://daringfireball.net/projects/markdown/syntax.
Images are not available as addImage or
addPlot is available. Pandoc footnotes have been
added (see
http://johnmacfarlane.net/pandoc/README.html#footnotes.
addMarkdown(doc, file, text, ...)document object
markdown file. Not used if text is provided.
character vector. The markdown to parse.
further arguments passed to other methods
a document object
docx, addMarkdown.docx ,
html, addMarkdown.html ,
pptx, addMarkdown.pptx