feat: code_cov badge (#821)

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

README.md

@@ -10,6 +10,7 @@
 [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7272/badge)](https://bestpractices.coreinfrastructure.org/projects/7272)
 [![Link to documentation](https://img.shields.io/static/v1?label=%F0%9F%93%96&message=Documentation&color=blue)](https://docs.k8sgpt.ai/)
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt.svg?type=shield)](https://app.fossa.com/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt?ref=badge_shield)
+[![codecov](https://codecov.io/github/k8sgpt-ai/k8sgpt/graph/badge.svg?token=ZLR7NG8URE)](https://codecov.io/github/k8sgpt-ai/k8sgpt)
 
 `k8sgpt` is a tool for scanning your Kubernetes clusters, diagnosing, and triaging issues in simple English.
 
@@ -647,4 +648,4 @@ Find us on [Slack](https://join.slack.com/t/k8sgpt/shared_invite/zt-276pa9uyq-px
 
 
 ## License
-[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt.svg?type=large)](https://app.fossa.com/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt?ref=badge_large)
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt.svg?type=large)](https://app.fossa.com/projects/git%2Bgit.luolix.top%2Fk8sgpt-ai%2Fk8sgpt?ref=badge_large)