Add npmjs badge

README.md

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 # React components for/from haddock3 webapp
 
 [![github repo badge](https://img.shields.io/badge/github-repo-000.svg?logo=github&labelColor=gray&color=blue)]([https://github.com/i-VRESSE/haddock3-ui](https://github.com/i-VRESSE/haddock3-ui))
-[![Lint](https://github.com/i-VRESSE/haddock3-ui/actions/workflows/lint.yml/badge.svg)](https://github.com/i-VRESSE/haddock3-ui/actions/workflows/lint.yml)
+[![npmjs.com](https://img.shields.io/npm/v/@i-vresse/haddock3-ui.svg?style=flat)](https://www.npmjs.com/package/@i-vresse/haddock3-ui)
+[![CI](https://github.com/i-VRESSE/haddock3-ui/actions/workflows/lint.yml/badge.svg)](https://github.com/i-VRESSE/haddock3-ui/actions/workflows/lint.yml)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.12820670.svg)](https://doi.org/10.5281/zenodo.12820670)
 
 The [haddock3 web application](https://github.com/i-VRESSE/haddock3-webapp) had several components that could be used outside of the web application. This package contains those components.