added array algorithms & readme

Author: saihariG

Arrays/IntegerReverse.java

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+package Arrays;public class IntegerReverse {
+}

Arrays/KadanesAlgorithm.java

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+package Arrays;
+
+// Largest Sum in a given array
+public class KadenesAlgorithm {
+
+     public static void main(String[] args) {
+
+     }
+
+}

Arrays/SmallestDifference.java

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+package Arrays;public class SmallestDifference {
+}