Update README.md

Include thanks and instructions

README.md

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 # XiaomiIR_ESPHome
-Custom ESPHome Firmware for the Xiaomi IR Controller
+Custom ESPHome Firmware for the Xiaomi Mijia Universal IR Remote Controller
+
+Thank you to Paul Nicholls for his work on adapting the Arduino ESP32 Core to the Single Core Processor variant used by Xiaomi, and his resulting Linp Doorbell ESPHome integration.
+
+https://github.com/pauln/arduino-esp32/wiki
+
+https://github.com/pauln/esphome-linp-doorbell-g03
+
+Flashing Instructions:
+ - Load yaml file to ESPHome and adjust parameters to suit your setup.
+ - Validate yaml and ensure no errors.
+ - Manually compile and download binary firmware file.
+ - Open the unit and solder GND, RX0 and TX0 to your USB-TTL Serial adapter.
+ - Press and hold Reset whilst plugging in MicroUSB power.
+ - Flash the unit with the ESPHome Flasher software.
+