Add stub for screensaver with version and how to launch

source/3/3.2/3.2.20/screensaver.rst

@@ -0,0 +1,19 @@
+Chapter 3.2.20 Screensaver
+==========================
+
+Screensave is an application to control what screensavers are used on the system. 
+
+Version
+-------
+Lubuntu ships with version 5.36 of Screensaver
+
+How to launch
+-------------
+
+To launch screensaver from the menu -> Prefrences -> Screensaver or run 
+
+.. code:: 
+
+   xscreensaver-demo
+
+from the command line. 

source/3/3.2/Preferences.rst

@@ -24,4 +24,5 @@ This chapter sets up the many prefrences included within lubuntu for themeing an
   3.2.15/users_and_groups
   3.2.16/window_effects
   3.2.17/alternative_configurator
-  3.2.19/Printers.rst
+  3.2.19/Printers
+  3.2.20/screensaver