Update README.md

README.md

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 # Dataset Card for "COGS"
 
-[More Information needed](https://github.com/huggingface/datasets/blob/main/CONTRIBUTING.md#how-to-contribute-to-the-dataset-cards)
+It contains the dataset used in the paper [COGS: A Compositional Generalization Challenge Based on Semantic Interpretation.](https://aclanthology.org/2020.emnlp-main.731.pdf)
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+It has four splits, where **gen** refers to the generalization split and **train_100** refers to the training version with 100 primitive exposure examples.