Re-organize to match PackMan layout

We want this to eventually become a PackMan package, so making the layout match now.

Author: william-w-armstrong

Assets/CrossSceneReference/Documentation~/guid-based-reference.md

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+Guid Based Reference
+
+Summary
+A component to give a Globaly Unique IDentifier (GUID) to a Game Object.
+This GUID can then be used to reference an object even if it is another Scene, not loaded yet, or otherwise not easy to directly reference.
+
+Maintainers
+William Armstrong williama@unity3d.com
+
+To Use:
+
+Add a GuidComponent to any object you want to be able to reference.
+
+In any code that needs to be able to reference objects by GUID, add a GuidReference field.
+
+GuidReference.gameObject will then return the GameObject if it is loaded, otherwise null.
+
+Look in the CrossSceneReference/SampleContent folder for example usage.
+
+Load up the LoadFirst scene, and then use the SceneLoader object to load 'LoadSecond'
+
+You should see the CrossSceneReferencer object find the CrossSceneTarget object, and set both of them to start spinning.
+