Add screenshots and start docs

Refs #6453

Code/Mantid/docs/source/interfaces/ScriptingWindow.rst

@@ -7,5 +7,55 @@ Scripting Window
 Overview
 --------
 
+.. image:: /images/ScriptingWindow.png
+
+TODO
+
+Editor Options
+--------------
+
+TODO
+
+.. image:: /images/ScriptingWindow_FoldingOptionEnabled.png
+
+.. image:: /images/ScriptingWindow_WhitespaceOptionEnabled.png
+
+Execution Options
+-----------------
+
+The *Execution* menu contains options regarding the execution of the script, the
+two main options here are *Execute All* and *Execute Selection*.
+
+Execute All
+  This option will execute the entire script from the top down in the standard
+  way a Python script would be executed.
+
+Execute Selection
+  This option allows selection of a subset of the code to be executed, this is
+  selected by highlighting the lines you wish to execute in the editor window
+  and selecting the option.
+
+Note that when using th *Execute Selection* option you must have the entire line
+selected as the code is taken from the first highlighted character to the last.
+For this reason there is also a limitation that prevents you from executing a
+selection where the first line is indented at any level as this will generate an
+indentation warning from the Python interpreter since it is effectively seeing
+an indented block where it would not expect to.
+
+The *Clear Variables* option is used to clear the local variables in the current
+script, this is usually not something that would need to be done as it is done
+automatically before each execution of a script.
+
+The *Mode* option allows you to switch between running the script asynchronously
+or serialised with the UI, typically running scripts serialised is not
+recommended as you will lose control of the MantidPlot UI whilst the script is
+being executed.
+
+Script Output
+-------------
+
+.. image:: /images/ScriptingWindow_OutputOptions.png
+
+TODO
 
 .. categories:: Interfaces