Displaying the list of current tasks.
list - Lists out the tasks.list displays the current list of tasks you have stored.
Format:
list
Expected outcome:

Adding a todo task.
todo [description] - Adds a todo task to your list.Format:
todo DESCRIPTION
Example:
todo read book
Expected outcome:

Adding a event task.
event [description] /at DD/MM/YYYY HHMM - Adds a event task to your list with its date.Format:
event DESCRIPTION /at DATE
Example:
event project meeting /at 30/9/2019 1400
Expected outcome:

Adding a deadline task.
deadline [description] /at DD/MM/YYYY HHMM - Adds a deadline task to your list with its date.Format:
deadline DESCRIPTION /by DATE
Example:
deadline finish homework /by 30/9/2019 2359
Expected outcome:

Marking a task as done.
done [task_index] - Marks the task at task_index as doneFormat:
done TASK_INDEX
Example:
done 1
Expected outcome:

Deleting a task.
delete [task_index] - Deletes the task at task_index.Format:
delete TASK_INDEX
Example:
delete 1
Expected outcome:

Finding a task.
find [keyword] - Finds all tasks containing the ‘keyword’.Format:
find KEYWORD
Example:
find book
Expected outcome:
