The stopwatch$/$timer should use the four $7-$segment displays on the Basys $3$ board to

display time. The two MSB digits should display seconds. The two LSB digits should

be used to display time with the resolution of $10$ milliseconds: in other words, these

digits should go through the sequence $0..\mathrm{.}99$ in one second.

The design should enable four programmable modes:

$($i$)$ Mode $1($Counting Up from $00\mathrm{.}00)$ In this mode, the design acts as a

normal stopwatch. $1)$ It is initialized to $00\mathrm{.}00,2)$ It starts counting up after

the Start$/$Stop button is pressed, and counts to $99\mathrm{.}99,$ where it stops if no

action is taken, $3)$ It stops counting when the Start$/$Stop is pressed again,