include shap_plot_text and shap_waterfall methods

src/datashap/DataSHAP.py

@@ -147,4 +147,13 @@ class DataSHAP:
 
     def get_plot_rank(self, max_display=11):
         self.plot_bar, self.axis, self.rank = self.plot_rank(max_display=max_display)
-        return self.plot_bar, self.axis, self.rank
+        return self.plot_bar, self.axis, self.rank
+
+    def shap_plot_text(self, num, tag):
+        return shap.plots.text(self.shap_value[num, :, tag], display = False)
+    
+    def shap_waterfall(self, num, tag, max_display):
+        plot_waterfall, ax = plt.subplots()
+        shap.plots.waterfall(self.shap_value[num, :, tag], show=False, max_display=max_display)
+        plt.close()
+        return plot_waterfall