text: Title: Adding support for netCDF (*.nc) files
  Body: ### Feature request
  
  netCDF (*.nc) is a file format for storing multidimensional scientific data, which is used by packages like `xarray` (labelled multi-dimensional arrays in Python). It would be nice to have native support for netCDF in `datasets`.
  
  ### Motivation
  
  When uploading *.nc files onto Huggingface Hub through the `datasets` API, I would like to be able to preview the dataset without converting it to another format.
  
  ### Your contribution
  
  I can submit a PR, provided I have the time.