readme changed

Readme.md

@@ -139,6 +139,18 @@ hover_color | hover color, tuple: (light_color, dark_color) or single color
 text_color | text color, tuple: (light_color, dark_color) or single color
 text_font | button text font, tuple: (font_name, size)
 hover | enable/disable hover effect: True, False
+image | put an image on the button, removes the text, must be class PhotoImage
+
+CTkButton Methods:
+```python
+CTkButton.set_text(new_text)
+CTkButton.change_image(new_image)
+CTkButton.configure_color(bg_color=new_bg_color,
+                          fg_color=new_fg_color,
+                          hover_color=new_hover_color,
+                          text_color=new_text_color)
+```
+
 </details>
 
 ### CTkLabel

customtkinter/customtkinter_button.py

@@ -250,6 +250,13 @@ class CTkButton(tkinter.Frame):
         if self.text_label is not None:
             self.text_label.configure(text=self.text)
 
+    def change_image(self, image):
+        if self.image_label is not None:
+            self.image = image
+            self.image_label.configure(image=self.image)
+        else:
+            sys.stderr.write("ERROR (CTkButton): Cant change image because button has no image.")
+
     def on_enter(self, event=0):
         for part in self.canvas_fg_parts:
             if type(self.hover_color) == tuple and len(self.hover_color) == 2: