feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/userspawneventargs.txt

@@ -0,0 +1,17 @@
+URL: https://wiki.studiominus.nl/internalReference/UserSpawnEventArgs.html
+Title: People Playground Modding - UserSpawnEventArgs
+==================================================
+
+public class UserSpawnEventArgs
+Inherits System.EventArgs
+Event data for when the user spawns a spawnable.
+Fields
+public readonly GameObject Instance
+The instance that was spawned.
+
+public readonly SpawnableAsset SpawnableAsset
+A reference to the spawnable that was spawned.
+
+Methods
+public (constructor) UserSpawnEventArgs(GameObject instance, SpawnableAsset spawnableAsset)
+No description provided