Migrate To-Do List Storage to SQLite

[sweep-ai-deprecated]

This PR addresses issue #8, which requested the migration of the to-do list storage from a text file to a SQLite database.

Here's a summary of the changes:

• Created a new SQLite database file todo_db.sqlite to store the to-do list items.
• Updated the append_to_do, delete_to_do, and get_to_do_list_from_file functions in todo.py to interact with the SQLite database instead of the text file.
• Added exception handling to these functions to catch and handle any errors that occur while interacting with the database.

These changes should make the to-do list feature more robust and efficient.

Please review and let me know if any changes are needed.

Fixes #8.

To checkout this PR branch, run the following command in your terminal:

git checkout sweep/migrate-to-sqlite