Update README.md

Added codecov Badge to README.md

Author: rofrano

README.md

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 # lab-github-actions
 
 [![Build Status](https://github.com/rofrano/lab-github-actions/actions/workflows/workflow.yml/badge.svg)](https://github.com/rofrano/lab-github-actions/actions)
+[![codecov](https://codecov.io/gh/rofrano/lab-github-actions/graph/badge.svg?token=A1RZ7I75K9)](https://codecov.io/gh/rofrano/lab-github-actions)
 
 This is for NYU DevOps lab on using GitHub Actions with Redis for Continuous Integration