Update README.md

README.md

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 # CodeParrot 🦜 Dataset Cleaned (train)
 
-Train split of [CodeParrot 🦜 Dataset Cleaned](https://huggingface.co/datasets/lvwerra/codeparrot-clean).
+Train split of [CodeParrot 🦜 Dataset Cleaned](https://huggingface.co/datasets/lvwerra/codeparrot-clean).
+
+## Dataset structure
+```python
+DatasetDict({
+    train: Dataset({
+        features: ['repo_name', 'path', 'copies', 'size', 'content', 'license', 'hash', 'line_mean', 'line_max', 'alpha_frac', 'autogenerated'],
+        num_rows: 5300000
+    })
+})
+```