Upload COMPETITION_DESC.md with huggingface_hub

COMPETITION_DESC.md

@@ -28,6 +28,8 @@ For this reason, both the simulator and the submitted autonomous driving algorit
 ## Primary metric
 The primary metric of this challenge is HD-Score (HUGSIM Driving Score) defined as:
 ![hd-score](https://huggingface.co/datasets/XDimLab/competition_public_dataset/resolve/main/hd_score.png)
+where the driving policy items include driving with no collisions (NC) and drivable area compliance (DAC), these subscores are crucial for driving safety. The contributory items include time-to-collision (TTC) and comfort (COM), which may not directly cause failure cases when they are low. Besides, the weight for TTC is and the weight for COM is . The final HD-Score is averaged across all simulation timestamps and multiplied by the global route completion
+score R_c.
 
 ## How to participant in the competition
 1. Click the "Login with Huggingface" button.