KnapsackItem: added
KnapsackAlgo: added
SimpleItem: added
KnapsackReader: added
knapsack.txt: added
knapsack_big.txt: added
knapsack_small.txt: added
TestKnapsackAlgo: added
KnapsackAlgo: changed data type to List<KnapsackItem>
KnapsackReader: changed Output type to List<KnapsackItem>
SimpleItem: implemented
SimpleItem: added hashcode and equals