Add Markdown format

[gimmy]

Hello,
Thank you for the useful website!

May you add the markdown format as well?
It should be easy as it's like the Wiki format, just the link is formatted differently.
For example:
[arXiv:1909.08344](http://arxiv.org/abs/1909.08344)
instead of
[http://arxiv.org/abs/1909.08344 arXiv:1909.08344].

I will find it even more useful.
Thanks