docs: add ngx-perfect-scrollbar (#894)

Author: jdegand

README.md

@@ -1341,6 +1341,7 @@ to simplify usage and allow quick customization.
 * [ngx-tracing-beam](https://github.com/omnedia/ngx-tracing-beam) - A simple component library to add an animated tracing beam to your vertical scrolling.
 * [ngx-marquee](https://github.com/omnedia/ngx-marquee) - A simple component library to create an infinite scrolling marquee with your content.
 * [@omnedia/ngx-scrollbar](https://github.com/omnedia/ngx-scrollbar) - This component offers a custom scrollbar with smooth scrolling functionality and allows for full control over its appearance through styling.
+* [ngx-perfect-scrollbar](https://github.com/Harvest-Dev/ngx-perfect-scrollbar) - This fork of [ngx-perfect-scrollbar](https://github.com/zefoy/ngx-perfect-scrollbar) is an Angular wrapper library for [Perfect Scrollbar](https://utatti.github.io/perfect-scrollbar/).
 
 #### State Management