Add Solution to Binary Search (iterative)

Search/BinarySearch.swift

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+/**
+ * Question Link: https://leetcode.com/problems/binary-search/
+ * Primary idea: iterative implementation
+ * Time Complexity: O(log n), Space Complexity: O(1)
+ *
+ */
+
+class Solution {
+    func search(_ nums: [Int], _ target: Int) -> Int {
+        var pivot = 0
+        var left = 0
+        var right = nums.count - 1
+
+        while left <= right {
+            pivot = left + (right - left) / 2
+
+            if nums[pivot] == target {
+                return pivot
+            }
+
+            if target < nums[pivot] {
+                right = pivot - 1
+            } else {
+                left = pivot + 1
+            }            
+        }
+
+        return -1
+    }
+}