Add source example files

source/plotting/dash/simple_dashboard.py

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+import dash
+import pandas as pd
+from dash import Dash, html, dash_table, dcc
+from plotly.express import line
+
+
+data = pd.read_excel("france-communes.xlsx")
+dept = data.groupby("departement").sum("population")
+app = Dash("demo")
+app.layout = html.Div(children=[
+    html.H1(children="Dashboard"),
+    dash_table.DataTable(data=data.to_dict("records"), page_size=10),
+    dcc.Graph(id="dept-population", figure=line(dept, x=None, y="population")),
+    dcc.Dropdown(id="color-select", options=["#ff0000", "#00ff00"])
+])
+
+
+@app.callback(dash.Output("dept-population", "figure"), dash.Input("color-select", "value"))
+def update_dept_population(color):
+    return line(dept, x=None, y="population", color_discrete_sequence=[color])
+
+
+if __name__ == '__main__':
+    app.run(debug=True)