docs: improve LEARN.md and README.md

[kaushalpowar]

This PR enhances the LEARN.md and README.md files to provide a more comprehensive and user-friendly experience. The changes include:

LEARN.md Improvements:

• Improved Structure: The document is now organized into clear sections with headings and subheadings, making it easier to navigate and understand.
• Detailed Usage Guide: The usage instructions are more detailed and include step-by-step guidance with screenshots or code examples where appropriate.
• Troubleshooting Section: A new troubleshooting section has been added to address common issues and provide solutions.
• Contributing Guidelines: Clear contribution guidelines are now included to encourage community involvement.
• Technical Details: A new section provides insights into the application's architecture and implementation, including the technology stack and design choices.
• Enhanced Readability: The overall readability and clarity of the document have been improved through better formatting, grammar, and sentence structure.

README.md Improvements:

• Concise Overview: The README now provides a more concise and informative overview of the project, highlighting its key features and benefits.
• Badges: Badges have been added for Python, Streamlit, OpenAI, and the license, providing quick visual information about the project's dependencies and licensing.
• Improved Structure: The structure of the README has been improved for better readability and clarity.
• Installation Instructions: The installation instructions are more detailed and user-friendly.
• Usage Guide: A more comprehensive usage guide has been added to help users get started quickly.

These improvements aim to make the project more accessible to users and contributors, providing a clearer understanding of the application's functionality and how to use it effectively.