Add support for "default of credit card clients Data Set"

[anupamamurthi]

https://archive.ics.uci.edu/ml/datasets/default%2Bof%2Bcredit%2Bcard%2Bclients

Potential Tasks:

• Ensure the license permits open source us
• Verify that this dataset is appropriate for fairness tasks and subset it accordingly (removing un-necessary columns etc.)
• Ensure we have instance level records with protected attributes and outcomes
• First create sklearn-compatible dataset (dataframe) and an appropriate "classic" dataset (second priority)
• Create a simple notebook where the dataset is consumed and simple fairness measures and computed at least.
• DO NOT download and incorporate the data, rather include a function that will do this since data is not hosted in AIF360.