Update README.md

Author: sashaphmn

README.md

@@ -4,6 +4,7 @@
 [![Discord Chat](https://img.shields.io/discord/308323056592486420.svg)](https://discord.gg/bittensor)
 [![CodeQL](https://github.com/opentensor/bittensor/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/opentensor/bittensor/actions)
 [![PyPI version](https://badge.fury.io/py/bittensor.svg)](https://badge.fury.io/py/bittensor)
+[![Codecov](https://codecov.io/gh/opentensor/bittensor/graph/badge.svg)](https://app.codecov.io/gh/opentensor/bittensor)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) 
 
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