note setup instructions

README.md

@@ -7,3 +7,13 @@ Besides the writers, the `arduino` package.
 You'll need to be in the `dialout` group to use it.
 
 > sudo usermod -aG dialout $USER
+
+## GUI Setup
+
+- Install board ESP32-S3
+    * Board -> esp32 -> ESP32S3 Dev Module
+- Set USB mode to USB-OTG:
+    * Tools -> USB Mode -> USB-OTG(TinyUSB)
+- Connect the dev board to the PC (UART USB port)
+    * Select the arduino's port in Tools -> Port
+