Put Collision folder in CMakeLists.txt and altered paths.

include/Engine/Collision/TriggerSystem.h

@@ -1,7 +1,8 @@
-#ifndef PlayerSystem_h__
-#define PlayerSystem_h__
+#ifndef TriggerSystem_h__
+#define TriggerSystem_h__
 
 #include <glm/common.hpp>
+#include <unordered_set>
 
 #include "Core/System.h"
 #include "Core/EventBroker.h"
@@ -17,7 +18,7 @@ public:
     virtual void Update(World* world, ComponentWrapper& collision, double dt) override;
 
 private:
-    
+    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesInTrigger;
 };
 
 #endif