Add Product Hunt badge to README

Included a Product Hunt badge with a link and image to promote Xget on Product Hunt. This enhances project visibility and provides users with a quick way to access the Product Hunt page.

README.md

@@ -3,6 +3,7 @@
 # Xget 🚀
 
 <a href="https://trendshift.io/repositories/14768" target="_blank"><img src="https://trendshift.io/api/badge/repositories/14768" alt="xixu-me%2FXget | Trendshift" style="width: 250px; height: 55px;" width="250" height="55"/></a>
+<a href="https://www.producthunt.com/products/xget" target="_blank"><img src="https://api.producthunt.com/widgets/embed-image/v1/featured.svg?post_id=1039008" alt="Xget | Product Hunt" style="width: 250px; height: 55px;" width="250" height="55" /></a>
 
 [![Cloudflare Workers](https://img.shields.io/badge/Cloudflare%20Workers-F38020?&logo=cloudflare&logoColor=white)](#部署到-cloudflare-workers)
 [![Docker](https://img.shields.io/badge/Docker-2496ED?&logo=docker&logoColor=white)](#自托管部署)