feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/actoncollide.txt

@@ -0,0 +1,23 @@
+URL: https://wiki.studiominus.nl/internalReference/ActOnCollide.html
+Title: People Playground Modding - ActOnCollide
+==================================================
+
+public class ActOnCollide
+Inherits MonoBehaviour
+Behaviour that invokes a UnityEvent when it gets the MonoBehaviour.OnCollisionEnter2D message
+Fields
+public float ImpactForceThreshold
+[SkipSerialisation]
+The minimum amount of force required to invoke the event
+
+public float DispatchChance
+[SkipSerialisation]
+Chance from 0.0 to 1.0 that the event is triggered
+
+public Collider2D Collider
+[SkipSerialisation] [Tooltip("Leave null to allow any collider to trigger the event")]
+The collider to watch out for. Any collider triggers the event if this is null.
+
+public UnityEvent Actions
+[SkipSerialisation]
+The event that is invoked when a sufficient collision occurs. May be null.