Add Disfl-QA
Sounds great! It'll make things easier for the user while accessing the dataset. I'll make some changes to the current file then. I've updated with the suggested changes. Updated the README, YAML tags as well (not sure of Size category tag as I couldn't pass the path of `dataset_infos.json` for this dataset)

Dataset: https://github.com/google-research-datasets/disfl-qa

To-Do: Update README.md and add YAML tags