add versions

README.md

@@ -4,6 +4,11 @@ SpockReact is an easy way to automatically generate documentation from Spock tes
 
 ![Build & Test](https://github.com/Sonatai/spock-react/actions/workflows/build.yaml/badge.svg) ![Deployment](https://github.com/Sonatai/spock-react/actions/workflows/deploy.yaml/badge.svg) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
+**Prerequisite**
+![nodejs](https://img.shields.io/badge/NodeJs-21.5.0-green) ![npm](https://img.shields.io/badge/npm-8.15.0-green) ![yarn](https://img.shields.io/badge/yarn-1.22.19-green)
+
+Please install NodeJs and yarn in the right version (see above). Normally npm will be install in the matching version - please check if the version match with above.
+
 ## How it works
 
 Spock-React dynamically serves Spock test reports and makes them browsable, effectively turning your Spock test suite into living documentation, on the fly.