[ci skip] Add discord server link

Updated contact information format and added Discord link.

Author: Dreeam-qwq

README.md

@@ -13,9 +13,10 @@
 
 `./gradlew clean build`
 
-## Contact
+## 📫 Contact
 
-- 📫 Discord: `dreeam___` | QQ: `2682173972`
+- Discord: [`https://discord.gg/pUYdgX8cQM`](https://discord.gg/pUYdgX8cQM)
+- QQ: `2682173972`
 
 ## TODO