docs(readme): add coverage badge

Author: Orkuncakilkaya

README.md

@@ -9,6 +9,7 @@
 </p>
 <p align="center">
 <a href="https://github.com/fingerprintjs/fingerprint-pro-fastly-compute-proxy-integration"><img src="https://img.shields.io/github/v/release/fingerprintjs/fingerprint-pro-fastly-compute-proxy-integration" alt="Current version"></a>
+<a href="https://fingerprintjs.github.io/fingerprint-pro-fastly-compute-proxy-integration/"><img src="https://raw.githubusercontent.com/fingerprintjs/fingerprint-pro-fastly-compute-proxy-integration/gh-pages/badges.svg" alt="coverage"></a>
 <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/:license-mit-blue.svg" alt="MIT license"></a>
 <a href="https://discord.gg/39EpE2neBg"><img src="https://img.shields.io/discord/852099967190433792?style=logo&label=Discord&logo=Discord&logoColor=white" alt="Discord server"></a>
 </p>