Images and badges
Images can be inserted using  or, reference-style, ![Image][1] followed by a reference definition [1]: <http://url/b.jpg>.
More details may be found in the CommonMark documentation.
A status badge is a small image that provides at-a-glance information, for example the build status of a code repository. Badges are commonly displayed on GitHub READMEs and inserted in mdbook documentation as links to a crate's docs.rs documentation, GitHub repo, or crates.io page. More information about badges may be found in the awesome-badges repo and in the shields.io documentation.
There is no "badge" concept in the Markdown specification. Badges are simply clickable images e.g. [  ](link-to-webpage).