Add the functionality to add a new note

Description:

Currently, when the user clicks the plus icon to add a new note, no note is being created. The functionality to handle the addition of new notes is not implemented in the controller.

Tasks:

1. Implement Note Creation Function in the Controller:

   • Create a function that handles the logic for adding a new note, including input validation and state management.

2. Integrate the Function:

   • Connect the newly implemented function to the event handler for the plus icon, ensuring that clicking the icon triggers the creation of a new note.

3. Testing:

   • Verify that new notes are successfully created and displayed after the user interacts with the plus icon.

Expected Outcome:

When a user clicks the plus icon, a new note should be added and displayed in the notes list.