Create a new/extend an existing labCards on Markdown

Do we want people to use Markdown more or there is no need to push it? This idea came from policy translation and people may eventually encounter Markdown in other projects too.

We might include:

• pros/cons
• main differences to Word (or even Latex from the other side)
• links to Markdown Editors
• links to/description of syntax
• use cases (RMarkdown, GitHub READMEs, blog posts, ...)