the source files. have a check if the path is correct, it contains the SFML folder twice in your error:
C:\Users\Mert\source\repos\SFML\SFML\SFML.cpp
try to include files in your source code just with
#include "Graphics.hpp"
ORchange the configurations from Visual Studio to look for header files in the path "C:\Users\Mert\source\repos\" instead of "C:\Users\Mert\source\repos\SFML\".