Add window effects screenshot

source/3/3.2/3.2.16/window_effects.rst

@@ -16,6 +16,10 @@ The opacity tab is for transparency settings. Setting Opacity to 1.00 makes it o
 
 Fading windows can have some  differences. There is a checkbox for fading window during opactity changes so if the opacity changes it will smoothly fade. With this settings windows will fade in and out when opened and closed unless you don't them to which you can press the Avoid fade in out when windows opening and closing.  
 
+Screenshot
+----------
+.. image:: window_effects.png
+
 How to Launch
 -------------
 To launch window effects from the menu :menuselection:`Prefrences --> LXQt Settings --> Window effects` or run