Update measure-SelectionSort.ps1

Scripts/measure-SelectionSort.ps1

@@ -1,4 +1,27 @@
-class SelectionSort {
+<#
+.SYNOPSIS
+        Measures the speed of SelectionSort
+.DESCRIPTION
+        This PowerShell script measures the speed of the SelectionSort algorithm.
+        SelectionSort is an in-place comparison sorting algorithm. It has an O(n2) time complexity,
+	which makes it inefficient on large lists, and generally performs worse than the similar
+	insertion sort. Selection sort is noted for its simplicity and has performance advantages
+	over more complicated algorithms in certain situations, particularly where auxiliary memory
+	is limited. 
+.PARAMETER numIntegers
+        Specifies the number of integers to sort
+.EXAMPLE
+        PS> ./measure-SelectionSort.ps1
+        🕒 SelectionSort of 1000 integers took 0.3351773 sec
+.LINK
+        https://github.com/fleschutz/PowerShell
+.NOTES
+        Author: Markus Fleschutz | License: CC0
+#>
+
+param([int]$numIntegers = 1000)
+
+class SelectionSort {
     static Sort($targetList) {
         $n = $targetList.count