Implemented basic game dll interaction

src/Engine/System/SystemGraph.cpp

@@ -0,0 +1,15 @@
+#include "SystemGraph.h"
+
+using namespace Seele;
+
+void SystemGraph::addSystem(System::UPSystemBase system)
+{
+    systems.add(std::move(system));
+}
+
+void SystemGraph::run(dp::thread_pool<>& threadPool, float deltaTime)
+{
+    for(auto& system : systems) {
+        system->run(threadPool, deltaTime);
+    }
+}