Saishruthi

[WIP] Add regression metric

4

This PR adds regression metric to the toolkit

Add Regression Metric to the Toolkit

2

This issue is to track regression metric addition to the toolkit. - [ ] Mean Absolute Error

**Batch 1 - Housekeeping** - [ ] Update repo location in CRAN - [ ] Add about R in the [documentation](https://aif360.readthedocs.io/en/latest/index.html) - [ ] Code check **Advocacy** - [x] Talk...

- [ ] EqOddPostprocessing - [ ] CalibratedEqOddProcessing

[AIF360-R] In-processing algorithms

1

- [ ] ARTClassifier - [ ] GerryFairClassifier - [ ] MetaFairClassifier

- [ ] LFR - [ ] OptimPreproc