Add folders for prior work.

prior_works/cfcql/README.md

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+Datasets originally from:
+
+```
+@misc{shao2023counterfactualconservativeqlearning,
+      title={Counterfactual Conservative Q Learning for Offline Multi-agent Reinforcement Learning}, 
+      author={Jianzhun Shao and Yun Qu and Chen Chen and Hongchang Zhang and Xiangyang Ji},
+      year={2023},
+      eprint={2309.12696},
+      archivePrefix={arXiv},
+      primaryClass={cs.AI},
+      url={https://arxiv.org/abs/2309.12696}, 
+}
+```

prior_works/omar/README.md

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+Datasets originally from:
+
+```
+@misc{pan2022planbetteramidconservatism,
+      title={Plan Better Amid Conservatism: Offline Multi-Agent Reinforcement Learning with Actor Rectification}, 
+      author={Ling Pan and Longbo Huang and Tengyu Ma and Huazhe Xu},
+      year={2022},
+      eprint={2111.11188},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2111.11188}, 
+}
+```

prior_works/omiga/README.md

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+Datasets originally from:
+
+```
+@misc{wang2023offlinemultiagentreinforcementlearning,
+      title={Offline Multi-Agent Reinforcement Learning with Implicit Global-to-Local Value Regularization}, 
+      author={Xiangsen Wang and Haoran Xu and Yinan Zheng and Xianyuan Zhan},
+      year={2023},
+      eprint={2307.11620},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2307.11620}, 
+}
+```