Introducing Marked QL — Markdown preview in Finder

I&rsquo;ve been working on something small but useful, and it&rsquo;s out now: Marked QL , a Quick Look extension that renders Markdown previews right in Finder. Select a .md file, hit Spacebar, and you get a real preview — not plain text, not a sad monospace dump, but actual formatted output with math, diagrams, syntax highlighting, the works. It&rsquo;s a companion to Marked, but it…