Fetch the command list.
Keyword - Describe actionDescribe action and its outcome.
Example of usage: keyword (optional arguments)
Expected outcome: outcome
Bye - Exits programme.Programme closes.
Example of usage:  bye
Expected outcome: Programme closes
Clear - Deletes all tasks in the list.Example of usage:  clear
Expected outcome: List becomes empty
Deadline - Creates task with a deadline.deadline [description] /by [date]
Example of usage:  deadline tutorial /by 1/2/2020
Expected outcome: 1. [D][✗] tutorial (by 1/2/2020)
Delete - Deletes task with task number.delete [number]
Example of usage:  delete 1
Expected outcome: Deletes task numbered 1
Done - Marks task with task number as done.done [task number]
Example of usage:  done 1
Expected outcome: 1. [D][✓] tutorial (by 1/2/2020)
Event - Creates task that is an event.Event [description] /at [date]
Example of usage:  event party /at 1/2/2020
Expected outcome: 1. [E][✗] party (at 1/2/2020)
Find - Returns list of tasks with keyword in name.Find [keyword]
Example of usage:  find party
Expected outcome: 1. [E][✗] party (at 1/2/2020)
Todo - Creates task.Todo [description]
Example of usage:  todo finish tutorial
Expected outcome: 1. [T][✗] finish tutorial