added md and png

Examples/Charts/Multiplecharts.md

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+## PowerShell
+
+```powershell
+$xlFile = "$env:TEMP\ImportExcelExample.xlsx"
+Remove-Item $xlFile -ErrorAction Ignore
+
+$data =  ConvertFrom-Csv @"
+ID,Product,Quantity,Price,Total
+12001,Nails,37,3.99,147.63
+12002,Hammer,5,12.10,60.5
+12003,Saw,12,15.37,184.44
+12010,Drill,20,8,160
+12011,Crowbar,7,23.48,164.36
+"@
+
+$chart1 = New-ExcelChartDefinition -YRange "Price"   -XRange "Product" -Title "Item price"   -NoLegend -Height 225
+$chart2 = New-ExcelChartDefinition -YRange "Total   "-XRange "Product" -Title "Total sales"  -NoLegend -Height 225 -Row 9  -Column 15
+$chart3 = New-ExcelChartDefinition -YRange "Quantity"-XRange "Product" -Title "Sales volume" -NoLegend -Height 225 -Row 15
+
+$data | Export-Excel -Path $xlFile -AutoFilter -AutoNameRange -AutoSize -Show -ExcelChartDefinition $chart1,$chart2,$chart3
+```
+
+## Result
+![](./MultipleCharts.png)