Refactor file handling to use pathlib, add .gitignore file, and apply PEP8 fixes

[mahdirahimi1999]

Summary:

This pull request refactors the file handling code to use pathlib instead of open(), improving readability and simplicity. A .gitignore file has also been added, and several changes have been made to comply with PEP8 style guidelines.

Changes:

• Replaced open() calls with Path.read_text() and Path.write_text() for file I/O operations.
• Simplified the code to improve overall readability.
• Updated JSON file reading and writing with pathlib.
• Added a .gitignore file to exclude unnecessary files from version control.
• Applied PEP8 fixes to improve code style and consistency.

Why this is important:

• Better readability: pathlib provides a more Pythonic approach for file path handling and text reading/writing.
• Code simplification: The code is now cleaner and easier to understand.
• Future-proofing: pathlib is the modern way to handle file paths in Python, and this change aligns with modern Python practices.
• Improved version control: The .gitignore file ensures that unnecessary files are excluded from version control.
• PEP8 compliance: Ensuring the code adheres to PEP8 helps maintain consistency and readability across the codebase.

Please review the changes and let me know if you have any questions or suggestions.

[mahdirahimi1999]

Please check this PR.
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