Update README.md

Author: killshot13

README.md

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 # node-react-starter
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+[![gitguardian](https://github.com/STH-Coders/node-react-starter/actions/workflows/gitguardian.yml/badge.svg?branch=master)](https://github.com/STH-Coders/node-react-starter/actions/workflows/gitguardian.yml)
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 A simple fullstack starter application using Node.js, Express.js, React.js and MongoDB
 
 To run this project you need to add the backend and frontend dependencies.