Add solution for "Day 24: Crossed Wires", part 1

include/aoc/common/LogicGate.hpp

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2025  Stefan Müller
+//
+// This program is free software: you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <iostream>
+#include <string>
+
+class LogicGate
+{
+public:
+    enum class Kind { And, Or, Xor, Unknown };
+
+    std::string inputWire1;
+    std::string inputWire2;
+    std::string outputWire;
+    Kind kind{ Kind::Unknown };
+};
+
+std::istream& operator>>(std::istream& is, LogicGate& logicGate);
+std::istream& operator>>(std::istream& is, LogicGate::Kind& kind);