Add source example files

source/pandas/01-pandas-xls-charts/01-bar-chart.py

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+import pandas as pd
+
+
+# Create a Pandas dataframe from the data.
+df = pd.DataFrame([10, 20, 30, 20, 15, 30, 45])
+
+# Create a Pandas Excel writer using XlsxWriter as the engine.
+writer = pd.ExcelWriter('chart-demo.xlsx', engine='xlsxwriter')
+df.to_excel(writer, sheet_name='Sheet1')
+
+# Close the Pandas Excel writer and output the Excel file.
+
+# Get the workbook for the writer
+workbook: pd.ExcelWriter = writer.book
+worksheet = writer.sheets['Sheet1']
+chart = workbook.add_chart({"type": "column"})
+# Configure the series of the chart from the dataframe data.
+chart.add_series({'values': '=Sheet1!$B$2:$B$8'})
+
+# Insert the chart into the worksheet.
+worksheet.insert_chart('D2', chart)
+writer.close()