Update README.md

Author: xaoxuu

README.md

@@ -35,4 +35,5 @@ url: https://xaoxuu.com
 avatar: https://xaoxuu.com/assets/xaoxuu/avatar/rect-256@2x.png
 screenshot: https://xaoxuu.com/assets/xaoxuu/2022/10/23/63542895cfd29.png
 description: For all time, always.
+feed: https://xaoxuu.com/atom.xml
 ```