Added page on setting up external editors (and added notes on paths being absolute)

getting_started/scripting/external_editor.rst

@@ -0,0 +1,37 @@
+.. _doc_external_editor
+
+Using an external text editor
+==============================
+
+While godot has an inbuilt text editor, some developers have a tendency to
+want to use a text editor they are familiar with. Godot provides this
+option via the options under 
+``Editor -> Editor Settings -> Text Editor -> External``
+
+.. image:: img/editor_settings.png
+
+There are two fields: the executable path and command line flags. The flags
+allow you to better integrate the editor with godot. Godot will replace the
+following inside the flags parameter:
+
++---------------------+-----------------------------------------------------+
+| Field in Exec Flags | Is replaced with                                    |
++=====================+=====================================================+
+| {project}           | The absolute path to the project directory          |
++---------------------+-----------------------------------------------------+
+| {file}              | The absolute path to the file                       |
++---------------------+-----------------------------------------------------+
+| {col}               | The column number of the error                      |
++---------------------+-----------------------------------------------------+
+| {line}              | The line number of the error                        |
++---------------------+-----------------------------------------------------+
+
+Some example Exec Flags for various editors include:
+
++---------------------+-----------------------------------------------------+
+| Editor              | Exec Flags                                          |
++=====================+=====================================================+
+| geany/kate          | {file} --line {line} --column {col}                 |
++---------------------+-----------------------------------------------------+
+| atom/sublime text   | {file}:{line}                                       |
++---------------------+-----------------------------------------------------+

getting_started/scripting/index.rst

@@ -8,3 +8,4 @@ Scripting
    gdscript/index
    visual_script/index
    c_sharp/index
+   external_editor