add fixme comment to soon-to-be-overengineered SceenBootstrapper Class

Assets/Raindrop/Unity/SceneBootstrapperGenerator.cs

@@ -3,6 +3,9 @@ using UnityEngine;
 
 namespace Raindrop.Unity
 {
+    // fixme:
+    // this is kind of like a builder to generate a simple scene with bootstrapper.
+    // I don't think we should use something so complicated
     public class SceneBootstrapperGenerator
     {
         public static GameObject mtd;