Add flashing script

tools/oem-flash.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+MAC_ADDR=$(esptool.py --chip esp32 read_mac | sed -En "s/MAC: (.*)/\1/p" | uniq | sed 's/://g')
+esphome upload --device /dev/cu.usbserial* ../firmware/stock.yaml
+
+if ! command -v cp210x-cfg &> /dev/null
+then
+  # Get cp210x-cfg from https://github.com/DiUS/cp210x-cfg
+  echo "cp210x-cfg was not found; CP2102 will not be serialized or renamed"
+else
+  cp210x-cfg -N "Upsy Desky" -S $MAC_ADDR
+fi