A user can set a due date #27

[mohamedmahmoudkashif]

I implemented the due date as described in the opened issue #27 .
I modified in scss files to be more responsiveness.

[patrickbeck1337]

Unfortunately you did not adapt the tests. They are currently failing because of the new changes.

[patrickbeck1337]

I would use the patchValue method here and move the setting of the time to date into a specific private method. Like:
` onSubmit(): void {
if (this.taskForm.value.dueDate && this.taskForm.value.time) {
this.taskForm.patchValue({dueDate: this.setTimeToDate(this.taskForm.value.dueDate, this.taskForm.value.time)});
}
this.taskService.create(this.taskForm.value.name, this.taskForm.value.dueDate).subscribe(task => {
this.created.emit(task);
this.taskForm.reset();
});
}

private setTimeToDate(date: Date, time: string): string {
const hour = +time.split(':')[0];
const minute = +time.split(':')[1];
date.setHours(hour, minute);
return date.toISOString();
}`

[patrickbeck1337]

dueDate should be optional in my opinion.