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Map-2 > word0
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Given an array of strings, return a Map<String, Integer> containing a key for every different string in the array, always with the value 0. For example the string "hello" makes the pair "hello":0. We'll do more complicated counting later, but for this problem the value is simply 0.

word0(["a", "b", "a", "b"]) → {"a": 0, "b": 0}
word0(["a", "b", "a", "c", "b"]) → {"a": 0, "b": 0, "c": 0}
word0(["c", "b", "a"]) → {"a": 0, "b": 0, "c": 0}

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public Map<String, Integer> word0(String[] strings) { }

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