add doku.txt

doku.txt

+Hardware Timer didnt work https://github.com/khoih-prog/ESP8266TimerInterrupt#why-using-isr-based-hardware-timer-interrupt-is-better
+=> Software Timer https://ullisroboterseite.de/esp8266-timing.html#timer
+

src/main.cpp

 
 uint32_t m=0;
 void timerCallback(void *pArg)
-{ 
+{
   *((int *) pArg) += 1;
   
   Serial.print("hallo\n");
     ESP.restart();
   }
  
-  os_timer_setfn(&Timer1, timerCallback, &c);
+  os_timer_setfn(&Timer1, timerCallback, NULL);
   os_timer_arm(&Timer1, 1000, true);
 
   Serial.println("Ready");