feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/randomsoundbehaviour.txt

@@ -0,0 +1,20 @@
+URL: https://wiki.studiominus.nl/internalReference/RandomSoundBehaviour.html
+Title: People Playground Modding - RandomSoundBehaviour
+==================================================
+
+public class RandomSoundBehaviour
+Inherits MonoBehaviour
+Can play sounds picked randomly from the Clips array.NOTE: Just use the PlayRandomClipBehaviour instead. This class is redundant (but still functional)
+Fields
+public AudioClip[] Clips
+Clips to pick from
+
+public AudioSource AudioSource
+Optional audio source. If this is null, the sound will be played using PhysicalBehaviour.PlayClipOnce(AudioClip) if available. Otherwise, no sound is played.
+
+public bool PlayOnStart
+A random sound will be played on start if this is set to true
+
+Methods
+public void PlayClip()
+Play a random clip from Clips. If Clips is null or empty, no sound will be played. If AudioSource is null, this will fall back to the PhysicalBehaviour if available. If none of those are available, no sound is played.Also won't do anything if the component is not enabled