Link to source code - like a "view source" link

I would like to make a link in my .md article files to specific code files on the github repository.
I see the api "view source" links work just fine, but I'm not sure how to create my own "view this particular source file" link in an .md article.

I did see this in the docfx flavoured markdown page, but it's an "include" rather than just a link:
`[!code-csharp[Main](Program.cs)]`