A-UserGuide: User Guide

Add a User Guide to the project.

A-Release: Release

Release the product to be used by potential users.

A-MoreOOP: Use More OOP

Refactor the code to extract out closely related code as classes.

A-JavaDoc: JavaDoc

Add JavaDoc comments to the code.

Level-7: Save

Save the tasks in the hard disk automatically whenever the task list
changes, and load the data from the hard disk when the chatbot starts
up.

Level-6: Delete

Add support for deleting tasks from the list.

A-Jar: Create a JAR File

Package the app as an executable JAR file so that it can be distributed
easily.

A-Collections: Use Java Collections classes

Use Java Collections classes for storing data.

Level-5: Handle Errors

Update error handling code to make use of custom exceptions instead of
just printing to the console.

A-Packages: Organize into Packages

Divide and organise the classes into suitable Java packages.