Exercise 00 - Creating a state machine

In this exercise, you're going to be creating a state machine from scratch, and putting it in useReducer.

Goals

• Create a state machine reducer with 3 states: idle, running, and paused.
  • The state machine should start in the idle state.
  • When a TOGGLE event occurs in idle, the machine should transition to running.
  • When a TOGGLE event occurs in running, the machine should transition to paused.
  • When a TOGGLE event occurs in paused, the machine should transition back to running.
  • When a RESET event occurs in paused, the machine should transition back to idle.
• Dispatch those TOGGLE events when the Start timer and Pause timer buttons are pressed. Additionally, clicking on the elapsed time should also start the timer.
• Only show the Pause timer button when the state is 'running'.
• Only show the Start timer button when the state is either paused or idle.