ADD file via upload

file_monitor.h

@@ -0,0 +1,32 @@
+#pragma once
+#include <string>
+#include <functional>
+#include <thread>
+#include <atomic>
+#include <filesystem>
+#include <unordered_map>
+#include <chrono>
+
+namespace fs = std::filesystem;
+
+class FileMonitor {
+public:
+    using FileCallback = std::function<void(const std::string&, const std::string&)>;
+    
+    FileMonitor(const std::string& root_path, FileCallback callback);
+    ~FileMonitor();
+    
+    void start();
+    void stop();
+
+private:
+    void monitor_thread();
+    void scan_directory(const fs::path& dir);
+    std::string read_file_content(const fs::path& path);
+    
+    std::string root_path_;
+    FileCallback callback_;
+    std::thread monitor_thread_;
+    std::atomic<bool> running_{false};
+    std::unordered_map<std::string, fs::file_time_type> file_times_;
+};