Update README.md

Author: hebertcisco

README.md

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 This example shows how to use FastApi 0.88.0 on Vercel with Serverless Functions using the [Python Runtime](https://vercel.com/docs/concepts/functions/serverless-functions/runtimes/python).
 
+[![Python testing](https://github.com/hebertcisco/deploy-python-fastapi-in-vercel/actions/workflows/python-app.yml/badge.svg)](https://github.com/hebertcisco/deploy-python-fastapi-in-vercel/actions/workflows/python-app.yml)
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 ## Demo
 
 [deploy-python-fastapi-in-vercel.vercel.app](https://deploy-python-fastapi-in-vercel.vercel.app)