SICK dataset 
Hi, this would be great to have this dataset included. I might be missing something, but I could not find it in the list of already included datasets. Thank you. 

## Adding a Dataset
- **Name:** SICK
- **Description:**  SICK consists of about 10,000 English sentence pairs that include many examples of the lexical, syntactic, and semantic phenomena. 
- **Paper:** https://www.aclweb.org/anthology/L14-1314/
- **Data:** http://marcobaroni.org/composes/sick.html
- **Motivation:** This dataset is well-known in the NLP community used for recognizing entailment between sentences.

Instructions to add a new dataset can be found [here](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md).
