adding a new icon and lena.png; adding openCamera() method manually to src/GUI.py after merge

src/GUI.py

@@ -56,6 +56,7 @@ class GUI:
         file_menu = tk.Menu(menu, tearoff=0)
         menu.add_cascade(label="File", menu=file_menu)
         file_menu.add_command(label="Open Image", command=lambda: self._openImage())
+        file_menu.add_command(label="Open Camera", command=lambda: self._openCamera())
         file_menu.add_command(label="Save Image", command=lambda: self._saveImage())
         file_menu.add_command(label="Exit", command=root.quit)
 
@@ -441,3 +442,7 @@ class GUI:
                 canvas_left, canvas_top, canvas_right, canvas_bottom,
                 outline="red", width=3, fill=""
             )
+
+    def _openCamera(self):
+        camera = CameraWindow()
+        camera.run(self)