Update readme

README.md

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   download_size: 74540072
   dataset_size: 260178368
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-# Dataset Card for "marc-multilingual"
+# marc-code-mixed-small
 
-[More Information needed](https://github.com/huggingface/datasets/blob/main/CONTRIBUTING.md#how-to-contribute-to-the-dataset-cards)
+This dataset is based on [The Multilingual Amazon Reviews Corpus](https://huggingface.co/datasets/amazon_reviews_multi).
+
+It contains German (DE), English (EN), Spanish (ES), and French (FR) languages. 
+
+The labels are 0 (DE), 1 (EN), 2 (ES), and 3 (FR). 
+
+Each review contains all four languages.