added dataset information to README.md

README.md

@@ -37,6 +37,16 @@ print(classifier("uneasy mishmash of styles and genres ."))
 print(classifier("by the end of no such thing the audience , like beatrice , has a watchful affection for the monster ."))
 ```
 
+## Dataset
+
+From the dataset page:
+
+> "The Stanford Sentiment Treebank is a corpus with fully labeled parse trees that allows for a complete analysis of the compositional effects of sentiment in language.
+> ...
+> Binary classification experiments on full sentences (negative or somewhat negative vs somewhat positive or positive with neutral sentences discarded) refer to the dataset as SST-2 or SST binary."
+
+Examples: https://huggingface.co/datasets/sst2/viewer
+
 ## Metric
 
 Accuracy on the `'validation'` split of SST-2: 0.9278