I'm an inline-style link with title
I'm a relative reference to a repository file
You can use numbers for reference-style link definitions
Or leave it empty and use the link text itself.
URLs and URLs in angle brackets will automatically get turned into links.
http://www.example.com or http://www.example.com and sometimes
example.com (but not on Github, for example).
Some text to show that the reference links can follow later.