Add DebugBear (#16)

README.md

@@ -537,6 +537,7 @@
 ### Analysis, performance, optimization <a name="analysis"></a> [&#x2191;&nbsp;&#x2191;&nbsp;&#x2191;](#toc)
 * [Bundle Buddy](https://github.com/samccone/bundle-buddy) - a tool to help you find source code duplication across your javascript chunks/splits.
 * [Bundle Phobia](https://bundlephobia.com/) - know the performance impact of including an npm package in your app's bundle.
+* [DebugBear Page Speed Test](https://www.debugbear.com/test/website-speed) - free tool to test the loading speed of your website.
 * [Front-End Performance Checklist](https://github.com/thedaviddias/Front-End-Performance-Checklist) - an exhaustive list of elements you should check or at least be aware of, as a Front-End developer and apply to your project.
 * [Jampack](https://jampack.divriots.com/) - optimizes static websites for best user experience and best Core Web Vitals scores.
 * [Lighthouse](https://developers.google.com/web/tools/lighthouse/) - an open-source, automated tool for improving the quality of web pages. It has audits for performance, accessibility, progressive web apps, and more.