I'm reading Basic writing and formatting syntax of GitHub but failed to link directly to section in ordered file like this:
Status indicators such as are often referred to as Code Repository Badges. These repo badges can be applied with Markdown to show on your wiki or documentation page; many dynamic status badges including the
Build | Passing badge may be dependent on integrations with other services.
Github.com/dwyl/repo-badges project has a good list of the most commonly used badges; you can also create your own at http://shields.io, which also has a good list of devops-related and popularity/rating badges.