Add XOR QA Dataset
Hi @sumanthd17 

Looks like a good start! You will also need to add a Dataset card, following the instructions given [here](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md#manually-tag-the-dataset-and-write-the-dataset-card) I followed the instructions mentioned there but my dataset isn't showing up in the dropdown list. Am I missing something here? @yjernite  > I followed the instructions mentioned there but my dataset isn't showing up in the dropdown list. Am I missing something here? @yjernite

The best way is to run the tagging app locally and provide it the location to the `dataset_infos.json` after you've run the CLI:
https://github.com/huggingface/datasets-tagging
 This is a really good data card!!

Small changes to make it even better:
- Tags: the dataset has both "original" data and data that is "extended" from a source dataset: TydiQA - you should choose both options in the tagging apps
- The language and annotation creator tags are off: the language here is the questions: I understand it's a mix of crowd-sourced and expert-generated? Is there any machine translation involved? The annotations are the span selections: is that crowd-sourced?
- Personal and sensitive information: there should be a statement there, even if only to say that none could be found or that it only mentions public figures
Added XOR Question Answering Dataset. The link to the dataset can be found [here](https://nlp.cs.washington.edu/xorqa/)

- [x] Followed the instructions in CONTRIBUTING.md
- [x] Ran the tests successfully
- [x] Created the dummy data