Merge pull request #622 from npetrangelo/docs

Filled out making_a_scene in the docs

docs/source/getting_started/making_a_scene.rst

@@ -1,4 +1,15 @@
 Making a Scene
 ==============
 
-Talk about Scenes and organization, bring it all together.
+A scene is what renders when manim is executed. Each scene contains mobjects, which can then be animated as
+previously explained. In code, a scene is a class that extends ``Scene`` and implements the ``construct``
+function, like so. Manim will execute this function to render the scene.
+
+.. code-block:: python
+   :linenos:
+
+   from manimlib.imports import *
+
+   class ExampleScene(Scene):
+       def construct(self):
+           # Add and animate mobjects here