add class comment

ESPMegaPRO-firmware/lib/ESPMegaPRO/TimeStructure.hpp

@@ -1,6 +1,13 @@
 #pragma once
 #include <stdint.h>
 
+/**
+ * @brief The rtctime_t struct is a structure for storing the time.
+ * 
+ * This structure is used by the ESPMegaPRO library to store the time.
+ * 
+ * @warning This structure is not compatible with the Arduino Time library.
+ */
 struct rtctime_t {
     uint8_t hours;
     uint8_t minutes;