adding directional light actor

src/Engine/Actor/DirectionalLightActor.h

@@ -0,0 +1,17 @@
+#pragma once
+#include "Actor.h"
+#include "Component/DirectionalLight.h"
+
+namespace Seele
+{
+class DirectionalLightActor : public Actor
+{
+public:
+    DirectionalLightActor(PScene scene);
+    virtual ~DirectionalLightActor();
+    Component::DirectionalLight& getDirectionalLightComponent();
+    const Component::DirectionalLight& getDirectionalLightComponent() const;
+private:
+};
+DEFINE_REF(DirectionalLightActor)
+} // namespace Seele