feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/liquidcontainercontroller.txt

@@ -0,0 +1,40 @@
+URL: https://wiki.studiominus.nl/internalReference/LiquidContainerController.html
+Title: People Playground Modding - LiquidContainerController
+==================================================
+
+public class LiquidContainerController
+Inherits MonoBehaviour
+[ExecuteAlways]
+Controls the little liquid simulation visual in most liquid containers
+Fields
+public Rigidbody2D Rigidbody
+[SkipSerialisation]
+Reference to the rigidbody
+
+public AudioSource SloshingSource
+[SkipSerialisation]
+Reference to the AudioSource that plays the sloshing noise
+
+public float SloshingIntensity
+How intense should the sloshing noise be?
+
+public Material LowFidelityLiquid
+[SkipSerialisation]
+A reference to the material asset that is used when Fancy Effects is disabled
+
+public Bounds Container
+The bounds of the container that the particles will stay inside of
+
+public float FillPercentage
+How full should this container be, visually? Ranges from 0.0 to 1.0
+
+public float ParticleRadius
+How large are the particles? 1 by default.
+
+Properties
+public Color Color { get; set; }
+What colour should the particles be?
+
+Methods
+public void AddForce(Vector2 globalForce, float randomisation = 0)
+Add a force to all particles in the container (if it is a fancy container) in global space