Update README with annotation feature and new screenshot

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 <a href='https://flathub.org/apps/org.gnome.Loupe'><img width='240' alt='Download on Flathub' src='https://flathub.org/api/badge?svg&locale=en'/></a>
 
-Loupe is GNOME's default Image Viewer.
+Loupe is GNOME's default Image Viewer. This fork adds image annotation support.
 
 
 ## Technical Details
@@ -11,11 +11,12 @@ Loupe is GNOME's default Image Viewer.
 - Extendable and sandboxed image decoding via [glycin](https://gnome.pages.gitlab.gnome.org/glycin/)
 - Support for more than 15 image formats by default
 - Editing with crop, rotate, and flip for PNG and JPEG
+- **Image annotation** with freeform pen, rectangle, ellipse, triangle, and star tools
 - Extensive support for touchpad and touchscreen gestures
 - Accessible presentation of the most important metadata
 - Sleek but powerful interface developed in conjunction with GNOME Human Interface Guidelines
 
-![Image Viewer Screenshot](https://static.gnome.org/appdata/gnome-48/loupe/loupe-main.png)
+![Image Viewer Screenshot](data/screenshots/loupe-annotation.png)
 
 ## Supported Image Formats