docs: add npm downloads to readme

Author: cmorten

README.md

@@ -4,6 +4,7 @@
 </p>
 <p align="center">
   <a href="https://www.npmjs.com/package/@guidepup/playwright"><img alt="@guidepup/playwright available on NPM" src="https://img.shields.io/npm/v/@guidepup/playwright" /></a>
+  <a href="https://www.npmjs.com/package/@guidepup/playwright"><img alt="@guidepup/playwright available on NPM" src="https://img.shields.io/npm/dt/@guidepup/playwright"></a>
   <a href="https://github.com/guidepup/guidepup-playwright/actions/workflows/test.yml"><img alt="@guidepup/playwright test workflows" src="https://github.com/guidepup/guidepup-playwright/workflows/Test/badge.svg" /></a>
   <a href="https://github.com/guidepup/guidepup-playwright/blob/main/LICENSE"><img alt="@guidepup/playwright uses the MIT license" src="https://img.shields.io/github/license/guidepup/guidepup-playwright" /></a>
 </p>