readme code-health badge

Author: lantoli

README.md

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 # Atlas CLI plugin for MongoDB Atlas Provider
 
+[![Code Health](https://github.com/mongodb-labs/atlas-cli-plugin-terraform/actions/workflows/code-health.yml/badge.svg)](https://github.com/mongodb-labs/atlas-cli-plugin-terraform/actions/workflows/code-health.yml)
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 This repository contains the Atlas CLI plugin for MongoDB Atlas Provider. 
 
 WIP