Fixed Streamlit input handling and updated README

[D15A-Jai-61]

Summary

This pull request improves the stability and usability of the application by fixing input handling issues in the Streamlit interface and updating the project documentation for clarity and correctness.

Key Changes

• Replaced text-based inputs with numeric inputs across all prediction pages to prevent runtime errors caused by empty or invalid values.
• Improved overall app stability by ensuring safe input handling on page load and interaction.
• Updated the README to update setup instructions, ports, and project structure.
• Added a .gitignore file.

Impact

• Prevents Diabetes prediction page showing error due to empty/invalid user input.
• Ensures consistent and reliable predictions across all disease models.

Notes

• No changes were made to the trained machine learning models.
• Model predictions remain unchanged; only input handling and documentation were improved.