simple add

address       machine      assembly

0 		6,10	     mvi 10
1		8,2	     put r2
2		6,20         mvi 20
3		8,3          put r3
4               6,0          mvi 0
5               1,2          add r2
6               1,3          add r3
7               8,1          put r1
8               19,0         stop