added missing logger_state header

src/common/logger_state.hpp

@@ -0,0 +1,14 @@
+#ifndef __LOGGER_STATE
+#define __LOGGER_STATE
+
+#include <iostream>
+#include <chrono>
+#include <mutex>
+
+struct logger_state_t {
+    std::ostream *logger = &std::cout;
+    std::chrono::time_point<std::chrono::steady_clock> beginning = std::chrono::steady_clock::now();
+    std::mutex log_mutex;
+};
+
+#endif //__LOGGER_STATE