Do note, however, that troff is generally used to output PostScript or PDF files, while nroff is used for the internal manpage formatting. The GNU version, groff, combines them into one. If one makes a README meant to be read in a terminal, the following will present a formatted version to the viewer, eliminating the need to view the raw source:

man ./README

There, no markdown pager, or reading of raw markdown necessary. Do not heed those others, who speak of "accepted standards." :P