Add Notebook on Feature Engineering

[Cgarg9]

Description:

Feature engineering is crucial for improving model performance, but this topic is currently missing from the folder. The notebook should introduce techniques like one-hot encoding, binning, polynomial features, and feature scaling.

Tasks:

• Create a notebook covering various feature engineering techniques.
• Provide examples and sample data to illustrate methods like encoding, scaling, and binning.
• Name the notebook feature_engineering.ipynb.
• Update the README with a links resources referenced.