feat: added Sysfs reader stub and tests, builds cleanly

src/core/SysfsRead.cxx

@@ -0,0 +1,15 @@
+// SysfsRead.cxx
+
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Author: Unai Blazquez <unaibg2000@gmail.com>
+
+#include "SysfsRead.hpp"
+
+SysfsReader::SysfsReader(const std::filesystem::path& input_path)
+    : m_path(input_path)
+{
+}
+SysfsStatus SysfsReader::read_status() const
+{
+  return SysfsStatus::UnexpectedValue;
+}