Add downloads badge to README

Add a downloads badge to the README.

Author: 2977094657

README.md

@@ -8,6 +8,7 @@
     <p><b>特别致谢</b>：<a href="https://github.com/ycccccccy/echotrace">echotrace</a>（本项目大量功能参考其实现，提供了重要技术支持）</p>
     <img src="https://img.shields.io/github/v/tag/LifeArchiveProject/WeChatDataAnalysis" alt="Version" />
     <img src="https://img.shields.io/github/stars/LifeArchiveProject/WeChatDataAnalysis" alt="Stars" />
+    <img src="https://gh-down-badges.linkof.link/LifeArchiveProject/WeChatDataAnalysis" alt="Downloads" />
     <img src="https://img.shields.io/github/forks/LifeArchiveProject/WeChatDataAnalysis" alt="Forks" />
     <img src="https://img.shields.io/github/license/LifeArchiveProject/WeChatDataAnalysis" alt="License" />
     <img src="https://img.shields.io/badge/Python-3776AB?logo=Python&logoColor=white" alt="Python" />