[tex-live] Recommendations for viewer_md

[David Carlisle]

one possibility for a general markdown convertor that could possibly
be included in texlive by default would be to use the markdown.lua
from
https://github.com/mpeterv/markdown
I haven't tested it much but it worked quite well on a couple of
README.md files that I tried
eg

texlua markdown.lua
/usr/local/texlive/2016/texmf-dist/doc/latex/bxjalipsum/README.md

which made a reasonable README.html and avoids having to handle
Japanese characters in the terminal with less or more.

It's only 38K of lua in a single file so quite a lightweight addition.

David