docs: update README to include additional badges for CodeFactor, filesize, version, and jsDelivr

Author: bfiessinger

README.md

@@ -1,5 +1,10 @@
 # ScrollToSmooth
 
+[![CodeFactor](https://img.shields.io/codefactor/grade/github/bfiessinger/scrolltosmooth?style=for-the-badge)](https://www.codefactor.io/repository/github/bfiessinger/scrolltosmooth)
+[![Filesize](https://img.shields.io/bundlephobia/minzip/scrolltosmooth?style=for-the-badge)](https://bundlephobia.com/result?p=scrolltosmooth)
+![Version](https://img.shields.io/github/v/release/bfiessinger/scrollToSmooth?include_prereleases&style=for-the-badge)
+[![](https://img.shields.io/jsdelivr/gh/hy/bfiessinger/scrolltosmooth?style=for-the-badge)](https://www.jsdelivr.com/package/gh/bfiessinger/scrollToSmooth)
+
 Lightweight **Vanilla JavaScript smooth scrolling library** with zero dependencies.
 
 ScrollToSmooth provides fully customizable scroll animations powered by `requestAnimationFrame`.