feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/decalinstruction.txt

@@ -0,0 +1,25 @@
+URL: https://wiki.studiominus.nl/internalReference/DecalInstruction.html
+Title: People Playground Modding - DecalInstruction
+==================================================
+
+public struct DecalInstruction
+All information needed to create a decal on an object.
+Properties
+public DecalDescriptor type { get; set; }
+The decal descriptor. This decides what decal will be placed.
+
+public Vector2 globalPosition { get; set; }
+The traget position in global space.
+
+public float size { get; set; }
+The size of the decal.
+
+public Color colourMultiplier { get; set; }
+The colour multiplier of the decal
+
+Methods
+public (constructor) DecalInstruction(DecalDescriptor type, Vector2 globalPosition, float size = 1)
+No description provided
+
+public (constructor) DecalInstruction(DecalDescriptor type, Vector2 globalPosition, Color color, float size = 1)
+No description provided