TODO: Write a method called AddItem

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$*$ The method should return a bool returns

$*$ a bool and takes an Item parameter.

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$*$ This method should iterate through the

$*$ mItems vector, looking for any vector element

$*$ that is default.

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$*$ If a default Item is found, it should assign

$*$ that vector element to the Item passed in and

$*$ return true. Otherwise it should return false.

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