Added README.md to "Book Recommendation System" & "Restaurant Recommender" (Recommendation Models)

[psanyalaich]

Description

Added README.md files to "Book Recommendation System" & "Restaurant Recommender".

Fixes #1447

Type of change

• Added a new machine learning frameworks, libraries or software.
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[sanjay-kv]

could you work on the conflicts