feat(plotnine): implement scatter-color-groups

Adds plotnine implementation for scatter plot with color groups.

Uses the iris dataset to demonstrate categorical color grouping
with sepal measurements colored by species.

Author: github-actions[bot]

plots/plotnine/point/scatter-color-groups/default.py

@@ -0,0 +1,24 @@
+"""
+scatter-color-groups: Scatter Plot with Color Groups
+Library: plotnine
+"""
+
+import seaborn as sns
+from plotnine import aes, geom_point, ggplot, labs, scale_color_brewer, theme, theme_minimal
+
+
+# Data
+data = sns.load_dataset("iris")
+
+# Create plot
+plot = (
+    ggplot(data, aes(x="sepal_length", y="sepal_width", color="species"))
+    + geom_point(size=3, alpha=0.7)
+    + labs(x="Sepal Length (cm)", y="Sepal Width (cm)", title="Scatter Plot with Color Groups", color="Species")
+    + scale_color_brewer(type="qual", palette="Set2")
+    + theme_minimal()
+    + theme(figure_size=(16, 9))
+)
+
+# Save
+plot.save("plot.png", dpi=300)