Update README: link to LongE2V-data dataset and usage instructions

README.md

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 license: apache-2.0
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+
+# LongE2V
+
+Released LoRA weights for **LongE2V**, fine-tuned on top of `THUDM/CogVideoX-5b-I2V`.
+
+- **Code**: training and evaluation scripts for this model are in the LongE2V code repository.
+- **Data**: preprocessed evaluation/training data (ECD, HQF, MVSEC) is released at [fansam39/LongE2V-data](https://huggingface.co/datasets/fansam39/LongE2V-data).
+
+## Files
+
+- `pytorch_lora_weights.safetensors`: LoRA weights for the CogVideoX-5b-I2V base model.
+
+## Usage
+
+```bash
+WEIGHT_URL=https://huggingface.co/fansam39/LongE2V/resolve/main/pytorch_lora_weights.safetensors bash scripts/download_weights.sh
+```
+
+Or with the Hugging Face CLI:
+
+```bash
+hf download fansam39/LongE2V pytorch_lora_weights.safetensors --local-dir weights
+```
+
+See the code repository's README for full inference and evaluation instructions.