added esphome component and hmi file

components/nextion_custom/automation.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <utility>
+
+#include "esphome/core/component.h"
+#include "esphome/core/automation.h"
+#include "nextion_custom.h"
+
+namespace esphome {
+namespace NextionCustom {
+
+class NextionCustomMsgIncomingTrigger : public Trigger<std::string> {
+ public:
+  explicit NextionCustomMsgIncomingTrigger(NextionCustom *parent) {
+    parent->add_incoming_msg_callback([this](const std::string &value) { this->trigger(value); });
+  }
+};
+
+}  // namespace NextionCustom
+}  // namespace esphome