Adding nlohmanns json library

src/Engine/Scene/Scene.h

@@ -1,14 +1,28 @@
+#pragma once
 #include "MinimalEngine.h"
 #include "Actor/Actor.h"
+#include "Graphics/GraphicsResources.h"
+#include "Components/PrimitiveComponent.h"
 
 namespace Seele
 {
+DECLARE_REF(Material);
+
 class Scene
 {
 public:
     Scene();
     ~Scene();
+    void tick(float deltaTime);
+    void addActor(PActor actor);
+    void addPrimitiveComponent(PPrimitiveComponent comp);
+
 private:
+    Map<PMaterial, DrawState> meshBatches;
     Array<PActor> rootActors;
+    Array<PPrimitiveComponent> primitives;
+
+public:
+    Map<PMaterial, DrawState> getMeshBatches();
 };
-}
+} // namespace Seele