docs: add coco & wit papers to references

intro.md

@@ -75,6 +75,28 @@ Due to time and resource contraints, we have yet to compare KoCLIP to other open
 }
 ```
 
+```bibtex
+@misc{lin2015microsoft,
+      title={Microsoft COCO: Common Objects in Context}, 
+      author={Tsung-Yi Lin and Michael Maire and Serge Belongie and Lubomir Bourdev and Ross Girshick and James Hays and Pietro Perona and Deva Ramanan and C. Lawrence Zitnick and Piotr Dollár},
+      year={2015},
+      eprint={1405.0312},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV}
+}
+```
+
+```bibtex
+@misc{srinivasan2021wit,
+      title={WIT: Wikipedia-based Image Text Dataset for Multimodal Multilingual Machine Learning}, 
+      author={Krishna Srinivasan and Karthik Raman and Jiecao Chen and Michael Bendersky and Marc Najork},
+      year={2021},
+      eprint={2103.01913},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV}
+}
+```
+
 ---
 
 We thank the teams at Hugging Face and Google for arranging this wonderful oportunity. It has been a busy yet enormously rewarding week for all of us. Hope you enjoy the demo!