Update measure-MergeSort.ps1

Scripts/measure-MergeSort.ps1

@@ -1,4 +1,25 @@
-param([int]$numIntegers = 1000)
+<#
+.SYNOPSIS
+        Measures the speed of MergeSort
+.DESCRIPTION
+        This PowerShell script measures the speed of the MergeSort algorithm.
+        MergeSort is an efficient, general-purpose, and comparison-based sorting algorithm.
+	Most implementations produce a stable sort, which means that the order of equal elements
+	is the same in the input and output. Merge sort is a divide-and-conquer algorithm that
+	was invented by John von Neumann in 1945. A detailed description and analysis of bottom-up
+	merge sort appeared in a report by Goldstine and von Neumann as early as 1948.
+.PARAMETER numIntegers
+        Specifies the number of integers to sort
+.EXAMPLE
+        PS> ./measure-MergeSort.ps1
+        🕒 MergeSort of 1000 integers took 0.3786619 sec
+.LINK
+        https://github.com/fleschutz/PowerShell
+.NOTES
+        Author: Markus Fleschutz | License: CC0
+#>
+
+param([int]$numIntegers = 1000)
 
 class MergeSort {