Merge pull request #314 from y0z/feature/add-eaf-fig

Add image to eaf

Author: nabenabe0928

package/visualization/plot_empirical_attainment_surface/README.md

@@ -17,6 +17,8 @@ This package provides empirical attainment surface implementation based on [the
 
 The details of empirical attainment surface are available in [`Python Tool for Visualizing Variability of Pareto Fronts over Multiple Runs`](https://arxiv.org/abs/2305.08852).
 
+![Empirical Attainment Surface](images/demo.png)
+
 ## APIs
 
 - `plot_empirical_attainment_surface(study_list: list[optuna.Study], attainment_ratios: list[int], ax: plt.Axes | None = None, color: str | None = None, label: str | None = None, linestyle: str | None = None, marker: str | None = None, log_scale_inds: list[int] | None = None, **ax_plot_kwargs)`