Added Class 6 HW

At last fixed local GA DS DC 2 repo. Pushing Class 6 HW. Thanks! -AV
This code is a bit more clear if you initialize sumh2h5 as an empty list:
sumh2h5 = []
And then within the loop, append elements to the list:
sumh2h5.append(health_2[5][i] + health_2[8][i])