Added spike folders for testing ideas

spikes/ConvertFrom-ExcelColumnName.ps1

@@ -0,0 +1,15 @@
+function ConvertFrom-ExcelColumnName {
+    param($columnName)
+
+    $sum=0
+    $columnName.ToCharArray() |
+        ForEach {
+            $sum*=26
+            $sum+=[char]$_.tostring().toupper()-[char]'A'+1
+        } 
+    $sum
+}
+
+ConvertFrom-ExcelColumnName p
+ConvertFrom-ExcelColumnName ah
+ConvertFrom-ExcelColumnName xfd