Add source example files

source/plotting/charts/plotly_sunburst.py

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+"""
+Display sales of various cities in a sunburst chart.
+
+Given the cities can have recurring parents, we can have
+a sunburst chart with 2 rings, the centermost ring for the
+country, and the outmost ring to have sales per city.
+"""
+import pandas as pd
+import plotly
+from plotly.express import sunburst
+
+if __name__ == '__main__':
+    df = pd.DataFrame(data={
+        "country": ["France", "France", "Spain", "Spain", "England", "England", "England"],
+        "city": ["Montpellier", "Bordeaux", "Madrid", "Valencia", "London", "Manchester", "Bristol"],
+        "sales": [150_000, 127_000, 97_200, 137_250, 200_000, 180_000, 150_000]
+    })
+    plot = sunburst(df, path=["country", "city"], values="sales", title="Sales by country and city", template="ggplot2",
+                    color_discrete_sequence=plotly.colors.qualitative.Dark2)
+    plot.layout.update({"font": {"family": "Cabin", "size": 13}})
+    plot.show()