feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/steamwarningdialog.txt

@@ -0,0 +1,23 @@
+URL: https://wiki.studiominus.nl/internalReference/SteamWarningDialog.html
+Title: People Playground Modding - SteamWarningDialog
+==================================================
+
+public class SteamWarningDialog
+Inherits MonoBehaviour
+No description provided
+Fields
+public float Delay
+The amount of time in seconds to wait
+
+public OptionalFloat Width
+Width override in pixels
+
+public OptionalFloat Height
+Height override in pixels
+
+public string Title
+The title of the dialog box, displayed at the top in bold. Can be null.
+
+public string Message
+[NaughtyAttributes.ResizableTextArea()]
+The message of the dialog box, displayed under the title. Can be null.