Added Memento pattern #40
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Close #20
I think this pattern has no sense in Kotlin. We could join
OriginatorandMementoand we could makeCareTakerdissappear because it is only a wrapper of a List of Mementos. Memento has a immutable state and if you want to modify it's state you would create a new Memento with another state and store them in a List in case you want to get back to some of them.What do you think?