Add source example files

source/plotting/charts/bar_chart_save.py

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+from typing import Iterable
+
+from matplotlib import pyplot as plot
+from matplotlib.axes import Axes
+from matplotlib.figure import Figure
+import matplotlib
+
+if __name__ == '__main__':
+    matplotlib.use("QtCairo")
+    labels: Iterable[str] = ("Janvier", "Février", "Mars", "Avril")
+    values: Iterable[float] = (50, 11.4, 91, 66.1)
+    figure: Figure
+    axis: Axes
+    figure, axis = plot.subplots(nrows=1, ncols=1)
+    axis.bar(x=labels, height=values, color="#00ff00")
+    axis.set_ylabel("Précipitations (mm)")
+    axis.set_xlabel("Mois")
+    axis.set_title("Précipitations pour 2022")
+    figure.savefig("bar-chart.png", transparent=True)