added violin plot function

cami_src/utils/plots.py

+import matplotlib.pyplot as plt
+
+def make_violinplot(value_dct, colors, color_groups, title, ylabel, ax):
+    # Create a plot
+    groups = list(value_dct.keys())
+    violins = ax[0].violinplot(list(value_dct.values()), showmeans=True, showextrema=True)
+
+    for violinpart in list(violins.keys())[2:]:
+        violins[violinpart].set_color('k')
+
+    for violin, group in zip(violins['bodies'], groups):
+        for i, color_group in enumerate(color_groups):
+            if group in color_group:
+                violin.set_facecolor(colors[i])
+                break
+    # Add title
+    ax.set_title(title, wrap=True, fontsize=14)
+
+    ax.set_xticks(list(range(1, len(value_dct) + 1)))
+    ax.set_xticklabels(value_dct.keys(), wrap=True)
+    ax.tick_params(axis='x', labelsize=11)
+    ax.set_ylabel(ylabel, wrap=True, fontsize=14)
+    return ax
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