Add power shell script

lib/obp60task/code_size.ps1

@@ -0,0 +1,12 @@
+param([string]$dir = ".")
+
+$total = 0
+
+Get-ChildItem $dir -Recurse -Include *.c, *.cpp, *.h -File | ForEach-Object {
+    $lines = [System.IO.File]::ReadLines($_.FullName).Count
+    Write-Output "$($_.FullName) : $lines"
+    $total += $lines
+}
+
+Write-Output "-----------------------"
+Write-Output "Over all files: $total"