Implement add, remove and modify functionalities

[emmiiorji]

This change implements add, remove and modify of the todo tasks.

The following applies:

• Each created task has a default completed value as false.
• The correct order of the remaining items is maintained on the delete of an item.
• Every modification of the items gets saved in the local storage.

Kindly find a screenshot of the app below:

[omar-labana]

Approved ✔️

Hi @emmiiorji

Congratulations on completing this project! 👏🏼 🎉

You have correctly implemented all of the requirements📃 correctly and without any errors⚠️ or bugs🪲.

Cheers and good luck in your next milestones! 🍀

Feel free to leave any questions or comments in the PR thread(don't forget to tag me 😄) if something is not 100% clear.

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