add logging class (not working version)

include/items/LoggingClass.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <Arduino.h>
+
+#include "Global.h"
+
+class LoggingClass {
+   public:
+    LoggingClass(unsigned long period, unsigned int maxPoints, String key);
+    ~LoggingClass();
+
+    void loop();
+    void writeDate();
+
+   private:
+
+   unsigned long currentMillis;
+   unsigned long prevMillis;
+   unsigned long difference;
+
+   unsigned long _period;
+   unsigned int _maxPoints;
+   String _key;
+};
+
+extern std::vector<LoggingClass*> myLogging;
+//extern LoggingClass* myLogging;