Add source example files

source/plotting/charts/plotly_iris_scatter.py

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+import pandas as pd
+from plotly import express as px
+
+data = pd.read_csv("https://archive.ics.uci.edu/ml/machine-learning-databases/iris/iris.data", header=None,
+                   names=["sepal-length", "sepal-width", "petal-length", "petal-width", "class"])
+
+plot = px.scatter(data, x="sepal-length", y="sepal-width", size="petal-width", color="class", template="seaborn",
+                  title="Iris flowers dataset",
+                  labels={"sepal-length": "Sepal length", "sepal-width": "Sepal width", "petal-width": "Petal width", "class": "Class"})
+plot.layout.update({"font": {"family": "Cabin", "size": 13}})
+plot.show()