Update README.md

Author: GiovanniBordiga

videos/README.md

@@ -1,6 +1,6 @@
 # Videos
 
-SI movies for the paper:
+## SI videos for the paper
 
 [G. Bordiga, E. Medina, S. Jafarzadeh, C. Boesch, R. P. Adams, V. Tournat, K. Bertoldi. Automated discovery of reprogrammable nonlinear dynamic metamaterials. _Nature Materials_. (2024).](https://doi.org/10.1038/s41563-024-02008-6)
 
@@ -16,4 +16,11 @@ https://github.com/bertoldi-collab/DifFlexMM/assets/16863374/fda885c3-ffd6-4b67-
 
 https://github.com/bertoldi-collab/DifFlexMM/assets/16863374/537a6e32-c62d-4fdc-8a9d-e4762fda8a21
 
+## Extra videos
+
 https://github.com/user-attachments/assets/7b8ea46b-ccde-4f3f-8c04-e4f9015d62e5
+
+https://github.com/user-attachments/assets/d6cfbc6a-9f5e-4ab4-a7a3-9c26235f0f7d
+
+https://github.com/user-attachments/assets/adf04ee9-3b14-4ea5-8b30-7fd5d93b1f1b
+