feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/showdialogbehaviour.txt

@@ -0,0 +1,33 @@
+URL: https://wiki.studiominus.nl/internalReference/ShowDialogBehaviour.html
+Title: People Playground Modding - ShowDialogBehaviour
+==================================================
+
+public class ShowDialogBehaviour
+Inherits MonoBehaviour
+Can be invoked to show a dialog box
+Fields
+public bool ShouldShowOnStart
+Should the dialog box be shown when the behaviour first starts?
+
+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.
+
+public bool PlayErrorSound
+Should an error noise be played when shown?
+
+public bool PlayWarningSound
+Should a warning noise be played when shown?
+
+Methods
+public void ShowDialog()
+Show the dialog box