Add GIF to README.md

Author: emilk

README.md

@@ -8,6 +8,8 @@
 
 Immediate mode plotting for [`egui`](https://github.com/emilk/egui).
 
+![egui_plot_white](https://github.com/user-attachments/assets/b29acf5e-ccbf-4cb7-b03b-7e258fa5db16)
+
 
 ### History
 This crate was originally hosted at https://github.com/emilk/egui but was extracted into its own repository on 2025-07-15.