feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/parallaxbehaviour.txt

@@ -0,0 +1,20 @@
+URL: https://wiki.studiominus.nl/internalReference/ParallaxBehaviour.html
+Title: People Playground Modding - ParallaxBehaviour
+==================================================
+
+public class ParallaxBehaviour
+Inherits MonoBehaviour
+[RequireComponent(typeof(Camera))]
+Moves and scales a transform to make it appear far away. This component requires a camera
+Fields
+public float Depth
+The apparent depth of the object
+
+public Vector2 Offset
+The apparent offset of the object
+
+public Vector2 Scale
+The apparent size of the object
+
+public Transform Container
+The object to transform