add persistent-scheduler

Author: Tony Dong

README.md

@@ -1817,7 +1817,7 @@ See also [Are we game yet?](https://arewegameyet.rs)
 ### Task scheduling
 
 * [delay-timer](https://github.com/BinChengZhao/delay-timer) - Time-manager of delayed tasks. Like crontab, but asynchronous tasks are possible. [![Build](https://github.com/BinChengZhao/delay-timer/actions/workflows/rust.yml/badge.svg)]( https://github.com/BinChengZhao/delay-timer/actions)
-* [persistent-scheduler](https://github.com/inboxsphere/persistent-scheduler) 
+* [persistent-scheduler](https://github.com/inboxsphere/persistent-scheduler) - A high-performance task scheduling system built with Tokio, offering task persistence, repeatable tasks, and Cron-based scheduling for reliable time-based operations.
 ### Template engine
 
 * Handlebars