add screenshot portion

source/3/3.3/3.3.5/screenshot.rst

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+Chapter 3.3.5 Screenshot
+========================
+
+Description
+-----------
+Screenshot is an application that lets you take pictures of what is on your screen. Features include a selectable area a delay, current window and entire screen to take pictures of. 
+
+Version
+-------
+Screenshot is version 3.25
+
+Screenshot
+----------
+.. image::
+   :width: 80%
+
+How to Launch
+-------------
+To launch in the menu > accessories > screenshot or run gnome-screenshot --interactive from the commandline.