add start platform function

platform.d

@@ -348,8 +348,8 @@ struct PlatformWindow
 	bool							locked_cursor;
 	bool							close;
 
+	SysThread         thread;
 	MessageQueue      msg_queue;
-
 	u32               input_idx;
 	Inputs[2]					inputs;
 	TicketMut         input_mutex;
@@ -506,6 +506,12 @@ CreateWindow(string name, u16 width, u16 height)
 	return window;
 };
 
+void
+StartPlatformThread(PlatformWindow* window)
+{
+	window.thread = CreateThread(&HandleEvents, window);
+}
+
 bool
 LockCursor(PlatformWindow* window)
 {