How to add an image that is also a link to an external page on Github's README.md?
Adding a markdown to display an image is pretty simple (answer at Add images to README.md on GitHub). Adding a link is also pretty simple (GitHub relative link in Markdown file), but it seems there's is no way to add an image that is also a link to an external site.
<a href="https://stackoverflow.com/"><img src="RELATIVE_PATH_TO_IMAGE></img></a>