Implement some functionality to make my application interactive like: mark task completion and clear completed ones

[khitermedachraf]

In this pull Request I fulfilled the following requirements🔥✔:

• Add a new JavaScript file and import it as a module:
  • it will contain methods related to the status updates (completed: true / false).
• Add event listener to the checkbox (change).
• Update the item's object's value for the completed key upon user actions.
• Implement a function for the "Clear all completed" button (use filter() method).
• Store the updated array of items in local storage, so the user gets the correct list values after the page reloads.

[khitermedachraf]

Thank you my code reviewer @elmar8287 🙏.