Add info string showing which evaluation is in use

src/evaluate.cpp

@@ -57,6 +57,11 @@ namespace Eval {
                   << "The UCI option EvalFile might need to specify the full path, including the directory/folder name, to the file." << std::endl;
         std::exit(EXIT_FAILURE);
     }
+
+    if (useNNUE)
+        sync_cout << "info string NNUE evaluation using " << eval_file << " enabled." << sync_endl;
+    else
+        sync_cout << "info string classical evaluation enabled." << sync_endl;
   }
 }