Adding Explanation to Merge Sort
Adding Explanation to Merge Sort

I have seen multiple examples from this week and previous weeks where people have failed to implement binary search, and just wrote something to pass the tests.  They will write simple linear search functions, and in one case, I saw someone straight up use `array.indexOf(item)`.

They appear to have looked at the example provided, saw what the function was expected to return, and not actually researched what Binary Search is.
leikkisa/core-algorithms