add XCSR dataset
> Hi ! Thanks for adding this dataset :)
> 
> Do you know how the translations were done ? Maybe we can mention that in the dataset card.
> 
> The rest looks all good to me :) good job with the dataset script and the dataset card !
> 
> Just one thing: we try to have dummy_data.zip files that are as small as possible, however here each zip file is 70KB+. It think we can make them even smaller if we remove unnecessary files in them. In particular in the `ar` dummy data zip file, we don't need the data for all languages, but rather only the `ar` files. Could you try to remove the unnecessary files in the dummy data zip files ?

Hi! 

Thank you so much for reviewing this PR. I've updated the README to briefly mention the translations and added a link to the paper, where a detailed description of the translation procedure can be found in the appendix.

For the dummy_data.zip files, is it possible to keep all the current files? I tried to remove some of the files, but the removal led to a failure in the local testing. We also think it may be better to keep the current dummy_data.zip files because all the data are useful actually. Thanks a lot!! Hi @lhoestq, just a gentle ping on this PR. :D  
Hi,

I wanted to add the [XCSR ](https://inklab.usc.edu//XCSR/xcsr_datasets) dataset to huggingface! :) 

I followed the instructions of adding new dataset to huggingface and have all the required files ready now! It would be super helpful if you can take a look and review them. Thanks in advance for your time and help. Look forward to hearing from you and can't wait to add XCSR to huggingface :D 