Dataset disclaimer (#247)

Adding disclaimer about dataset. https://github.com/pytorch/pytorch/issues/24865

README.md

@@ -143,3 +143,10 @@ If you plan to contribute new features, utility functions or extensions to the
 core, please first open an issue and discuss the feature with us. Sending a PR
 without discussion might end up resulting in a rejected PR, because we might be
 taking the core in a different direction than you might be aware of.
+
+Disclaimer on Datasets
+----------------------
+
+This is a utility library that downloads and prepares public datasets. We do not host or distribute these datasets, vouch for their quality or fairness, or claim that you have license to use the dataset. It is your responsibility to determine whether you have permission to use the dataset under the dataset's license.
+
+If you're a dataset owner and wish to update any part of it (description, citation, etc.), or do not want your dataset to be included in this library, please get in touch through a GitHub issue. Thanks for your contribution to the ML community!