feat: basic ecs start + renderer class

include/ecs/camera.h

@@ -0,0 +1,14 @@
+#ifndef ECS_ENTITY_CAMERA_H_
+#define ECS_ENTITY_CAMERA_H
+
+#include "ecs/entity.h"
+
+namespace ecs { 
+    class Camera : Entity {
+    public:
+        Camera() = default;
+        ~Camera() = default;
+    };
+}
+
+#endif // ECS_ENTITY_CAMERA_H_