Update README.md

README.md

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  All the [code](https://github.com/GeneralEmbodiedSystem/RoboticsDiffusionTransformer/tree/main?tab=readme-ov-file), pre-trained model weights, and [data](https://github.com/thu-ml/RoboticsDiffusionTransformer) are licensed under the MIT license.
 
- Please refer to our [project page](https://rdt-robotics.github.io/rdt-robotics/) and [paper]() for more information.
+ Please refer to our [project page](https://rdt-robotics.github.io/rdt-robotics/) and [paper](https://rdt-robotics.github.io/rdt-robotics/static/paper.pdf) for more information.
 
  ## Model Details