doc: add kubecon na 2025 presentation

Signed-off-by: jwcesign <[email protected]>

Author: jwcesign

README.md

@@ -233,6 +233,7 @@ If you have questions, feel free to reach out to us in the following ways:
 | KubeCon(China 2023) | [Break Through Cluster Boundaries to Autoscale Workloads Across Them on a Large Scale](https://www.youtube.com/watch?v=22W1yrEJjtQ) |
 | KubeCon(China 2023) | [Cross-Cluster Traffic Orchestration with eBPF](https://www.youtube.com/watch?v=e4GA5e-C7n0) |
 | KubeCon(China 2023) | [Non-Intrusively Enable OpenKruise and Argo Workflow in a Multi-Cluster Federation](https://www.youtube.com/watch?v=gcllTXRkz-E) |
+| KubeCon(NA 2025)    | [Maximizing Global Potential: Cost-Optimized, High-Availability Workloads Across Regions](https://www.youtube.com/watch?v=VrXt_T8DkIo) |
 
 For blogs, please refer to [website](https://karmada.io/blog/).