feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/decalrenderercontroller.txt

@@ -0,0 +1,18 @@
+URL: https://wiki.studiominus.nl/internalReference/DecalRendererController.html
+Title: People Playground Modding - DecalRendererController
+==================================================
+
+public class DecalRendererController
+Inherits MonoBehaviour, Messages.IDecal
+[System.Obsolete]
+No description provided
+Properties
+public abstract Vector2 BarrelPosition { get; }
+The global barrel position
+
+Methods
+public abstract void Shoot()
+Tell the behaviour to shoot
+
+public void Decal(DecalInstruction decalInstruction)
+No description provided