Add reset pin info

README.md

@@ -23,6 +23,7 @@ ATmega3208, ATmega4808, ATmega3209 and ATmega4809.
 * [Programming](#programming)
 * [Supported clock frequencies](#supported-clock-frequencies)
 * [BOD option](#bod-option)
+* [Reset pin](#reset-pin)
 * [Pinout](#pinout)
 * [How to install](#how-to-install)
   - [Boards Manager Installation](#boards-manager-installation)
@@ -86,6 +87,10 @@ Brown out detection, or BOD for short lets the microcontroller sense the input v
 | Disabled                       |
 
 
+## Reset pin
+None of the megaAVR-0 microcontrollers needs the reset line in order to be reprogrammed over the UPDI interface. This means that the reset pin can be used as a GPIO pin instead! There's no need for a high voltage programmer in order to turn that pin into a reset pin again either. If you have a development board you can instead use the reset button as a general purpose button for your project.
+
+
 ## Pinout
 This core provides several different Arduino pin mappings based on your current hardware
 - **Uno WiFi**: This pinout is 100% compatible with the Arduino Uno WiFi Rev2 hardware. If you have code that's written for the Uno WiFi Rev2 it will work without any modifications if you choose this pinout. Note that this pinout does pin swapping on serial interfaces and PWM pins by default, and some peripherals are renamed to match the original 328P Uno hardware better. Note that this pinout is only available on ATmega3209/ATmega4809.