Added an example to 14_imbalanced/handling_imbalanced_data_exercise.md

[MadhumithaKolkar]

3. Exercise: Predicting Customer Satisfaction Use the Customer Satisfaction dataset from Kaggle. - https://www.kaggle.com/datasets/teejmahal20/airline-passenger-satisfaction

   1. Build a classification model to predict customer satisfaction.

   2. Initially, use a logistic regression model from scikit-learn.

   3. Print the classification report and analyze precision, recall, and f1-score.

   4. Try to improve the f1-score for the minority class using techniques like undersampling, oversampling, or ensemble methods.

   5. [Solution] : https://www.kaggle.com/code/teejmahal20/classification-predicting-customer-satisfaction

   Thanks https://kaggle/teejmahal20 for providing this solution.