Add example.md with qbittorrent setup instructions

Add example content for qbittorrent configuration.

Author: adysec

example.md

@@ -0,0 +1,4 @@
+以`magnet:?xt=urn:btih:e831fcfaca5f0208009406b7b090014cef9228a9&dn=passwds`为例
+<img width="2952" height="984" alt="image" src="https://github.com/user-attachments/assets/4d3e9773-4f01-4038-bba6-8e894f193665" />
+qbittorrent配置方法
+<img width="1392" height="1366" alt="image" src="https://github.com/user-attachments/assets/65cce7a8-08d0-4ad1-8252-9c7cbbcc8311" />