add class comment

ESPMegaPRO-firmware/lib/ESPMegaPRO/DigitalInputIoT.hpp

@@ -7,6 +7,13 @@
 // MQTT Topics
 #define PUBLISH_ENABLE_TOPIC "publish_enable"
 
+/**
+ * @brief The DigitalInputIoT class is a class for connecting the Digital Input Card to the IoT module.
+ * 
+ * This function allows you to control the Digital Input Card using MQTT.
+ * 
+ * @warning You should not instantiate this class directly, instead use ESPMegaIoT's registerCard function.
+ */
 class DigitalInputIoT : public IoTComponent {
     public:
         bool begin(uint8_t card_id, ExpansionCard *card, PubSubClient *mqtt, char *base_topic);