docs: Highlight-DiffCells.ps1 example added

Examples/ConditionalFormatting/Highlight-DiffCells.ps1

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+try { Import-Module $PSScriptRoot\..\..\ImportExcel.psd1 } catch { throw ; return }
+#Get rid of pre-exisiting sheet
+$xlSourcefile = "$env:TEMP\ImportExcelExample.xlsx"
+
+
+Write-Verbose -Verbose -Message  "Save location: $xlSourcefile"
+Remove-Item $xlSourcefile -ErrorAction Ignore
+
+$data = ConvertFrom-Csv @"
+Region,State,Units2021,Units2022
+West,Texas,927,925
+North,Tennessee,466,466
+East,Florida,520,458
+East,Maine,828,661
+West,Virginia,465,465
+North,Missouri,436,235
+South,Kansas,214,214
+North,North Dakota,789,640
+South,Delaware,712,508
+"@
+
+
+
+$excel = $data | Export-Excel $xlSourcefile -AutoSize -PassThru
+
+Add-ConditionalFormatting -Worksheet $excel.sheet1 -Range "C2:D10" -ConditionValue '=C2=D2' -RuleType Expression -BackgroundColor Cyan
+
+Close-ExcelPackage $excel -Show