Added code to work with .parquet files

[thebadcoder96]

I added 2 files data-loading-parquet.ipynb and data-loading-parquet.py that deal with .parquet files for the NY taxi data (in case anyone wants to use the newer data). The lookup zones table is still a CSV file so I wrote the code to handle both csv and parquet files. Hopefully, this will be of use!

Also updated the readme file mentioning the above.