Add two new resources to #Review & Self Study section

[bikashdaga]

Updated the # Review & Self Study section of the README.md by adding two valuable resources:

1. 12 Real-World Data Science Applications with Examples - This resource provides practical examples of data science applications across various industries.
2. Data science in health care - A comprehensive look at how data science is transforming health care with real-world case studies.

These additions will help users gain a deeper understanding of data science applications in real-world scenarios.

Thanks!