Add NPM badge

README.md

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 <img alt="IO App Design System" src="repo-assets/io-app-design-system-github-cover.png" width="100%" style="max-width: 768px" align="center" /></br>
-<h3 align="center" style="width: 100%">A comprehensive library of components specifically designed for <a href="https://github.com/pagopa/io-app">IO App</a></h3>
+<h3 align="center" style="width: 100%">A comprehensive library of components specifically designed for the <a href="https://github.com/pagopa/io-app">IO App</a></h3>
+<!-- NPM Badge -->
+<a href="https://www.npmjs.com/package/@pagopa/io-app-design-system"><img alt="npm latest package" src="https://img.shields.io/npm/v/@pagopa/io-app-design-system/latest.svg"></a>
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 </div>