chore(readme): add badge (#284)

* chore(readme): add badge

* Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: AugustinMauroy

README.md

@@ -16,9 +16,15 @@
   <a title="MIT License" href="LICENSE">
     <img src="https://img.shields.io/badge/license-MIT-blue" alt="MIT License" />
   </a>
-   <a title="scorecard" href="https://securityscorecards.dev/viewer/?uri=github.com/nodejs/api-docs-tooling">
+  <a href="https://codecov.io/gh/nodejs/api-docs-tooling" >
+    <img src="https://codecov.io/gh/nodejs/api-docs-tooling/graph/badge.svg?token=TZRUKKDICU" alt="Codecov coverage badge"/>
+  </a>
+  <a title="scorecard" href="https://securityscorecards.dev/viewer/?uri=github.com/nodejs/api-docs-tooling">
     <img src="https://api.securityscorecards.dev/projects/github.com/nodejs/api-docs-tooling/badge" alt="api-docs-tooling scorecard badge" />
   </a>
+  <a href="https://www.bestpractices.dev/projects/29">
+    <img src="https://www.bestpractices.dev/projects/29/badge" alt="CII Best Practices badge">
+  </a>
 </p>
 
 ## Usage