Hey hey,
Question as title, is a .md file enough for the submission?
Thank you!
Yes!
If starting with markdown, you may use a tool such as pandoc to convert it to a PDF, or just leave it in raw markdown.
Markdown? Bah. Who needs all those `#` and `*` symbols padding out your file size. I've submitted a 13kb txt file.
A true master of minimalism.