Finding starting position of a target value in a sorted array with duplicates. Helps solving the leetcode problem: Find First and Last Position of Element in Sorted Array ( https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/ )

Finding starting position of a target value in a sorted array with duplicates. Helps solving the leetcode problem: Find First and Last Position of Element in Sorted Array