Update README.md

README.md

@@ -21,6 +21,8 @@ Ongoing Competitions:
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 | [Building3D Challenge](https://huggingface.co/spaces/Building3D/USM3D)        | LiDAR | 2024-05-31 | [Building3D](https://building3d.ucalgary.ca/) |   ✅   |
 |                  |                      |            |              |       |
+| [Structured Semantic 3D Reconstruction (S23DR) Challenge](https://huggingface.co/spaces/usm3d/S23DR)        | Vision | 2024-06-04 | [USM3D](https://huggingface.co/usm3d) |   ✅   |
+|                  |                      |            |              |       |
 | [End-to-End Driving at Scale](https://huggingface.co/spaces/AGC2024-P/e2e-driving-2024)        | Vision | 2024-06-01 | [OpenDriveLab](https://opendrivelab.com/challenge2024/) |   ✅   |
 |                  |                      |            |              |       |
 | [Predictive World Model](https://huggingface.co/spaces/AGC2024-P/predictive-world-model-2024)        | Vision | 2024-06-01 | [OpenDriveLab](https://opendrivelab.com/challenge2024/) |   ✅   |