Create basic Story classes and parameterize monsters in Battle scene

Assets/Story/StorySceneDatabase.cs

@@ -0,0 +1,14 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class StorySceneDatabase {
+    public static StoryScene Load(SceneId id) {
+        switch (id) {
+            case SceneId.Chapter1_Cave:
+                return new Scene_Chapter1_Cave();
+            default:
+                throw new System.NotImplementedException("StoryScene with id " + id + " missing.");
+        }
+    }
+}