docs(readme en): 补充遗漏的备份页图片

Author: ByteMancer-png

doc/README.en.md

@@ -6,6 +6,8 @@ RestLite is a file backup tool for the Windows platform that offers a simple and
 
 Use [restic](https://github.com/restic/restic) for backup and restore, and [rustic_core](https://github.com/rustic-rs/rustic_core) to browse snapshot files.
 
+![Backup Page](img/backup_view.en.png)
+
 ## ✨ Features
 
 - Manual Backup