Update readme.md

Author: SeptemberHX

readme.md

@@ -1,5 +1,7 @@
 # DDE Top Panel
 
+[!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/septemberhx)
+
 【中文请看】：[Deepin 论坛](https://bbs.deepin.org/forum.php?mod=viewthread&tid=195128&extra=)
 【全局菜单基本原理请看】：[Github WIKI](https://github.com/SeptemberHX/dde-top-panel/wiki/Linux-%E4%B8%8A%E7%9A%84%E5%85%A8%E5%B1%80%E8%8F%9C%E5%8D%95%E5%8E%9F%E7%90%86)