Store tasks in a config file

[janinainfa]

Store tasks in a config (or json) file so they don't disappear after rerunning the program (I can make this)

[ilyas829]

Can I do this this ?

[P-Potdar]

Hacktoberfest 2024 Contribution

Hi Maintainers,

I hope you’re doing well! I’m participating in Hacktoberfest 2024, and I’m excited to contribute to this project. 🎉 This PR implements a feature to store tasks in a config (or JSON) file so they persist even after rerunning the program. This should address the issue of tasks disappearing, which can enhance user experience by ensuring data remains consistent across sessions.

Summary of Changes:
Added support for saving tasks in a JSON file.
Implemented logic to load tasks from the file at startup and save them after updates.
Ensured backward compatibility and no breaking changes to the existing functionality.
Included test cases and documentation updates.
Benefits:
Persistence: Users’ tasks are now stored safely and don’t disappear on rerunning the program.
User Experience: This improves usability by maintaining consistency across sessions.
Looking forward to your review, and I’m happy to make any necessary adjustments based on your feedback!

Thank you for considering this PR for Hacktoberfest 2024