Update README.md

README.md

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 task_ids:
 - sentiment-classification
 ---
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+
+# Dataset Card for Mall.cz Product Reviews (Czech)
+
+
+## Dataset Description
+
+The dataset contains user reviews from Czech eshop <mall.cz>
+Each review contains text, sentiment (positive/negative/neutral), and automatically-detected language (mostly Czech, occasionaly Slovak) using [lingua-py](https://github.com/pemistahl/lingua-py)
+The dataset has in total (train+validation+test) 30,000 reviews. The data is balanced.
+
+Train set has 8000 positive, 8000 neutral and 8000 negative reviews.
+Validation and test set each have 1000 positive, 1000 neutral and 1000 negative reviews.
+
+
+## Dataset Features
+
+Each sample contains:
+- `review_id`: unique string identifier of the review.
+- `rating_str`: string representation of the rating - "pozitivní" / "neutrální" / "negativní"
+- `rating_int`: integer representation of the rating (1=positive, 0=neutral, -1=negative)
+- `comment_language`: language of the review (mostly "cs", occasionaly "sk")
+- `comment`: the string of the review
+
+
+## Dataset Source
+
+The data is a processed adaptation of [Mall CZ corpus](https://liks.fav.zcu.cz/sentiment/).
+The adaptation is label-balanced and adds automatically-detected language