info about board support

README.md

@@ -36,7 +36,7 @@ Turns a Raspberry Pi into an inexpensive, web-enabled kiln controller.
 
 | Image | Hardware | Description |
 | ------| -------- | ----------- |
-| ![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/rpi.png) | [Raspberry Pi](https://www.adafruit.com/category/105) | Virtually any Raspberry Pi will work since only a few GPIO pins are being used. |
+| ![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/rpi.png) | [Raspberry Pi](https://www.adafruit.com/category/105) | Virtually any Raspberry Pi will work since only a few GPIO pins are being used. Any board supported by [blinka](https://circuitpython.org/blinka) and has SPI should work. You'll also want to make sure the board has wifi. If you use something other than a Raspberry PI and get it to work, let me know. |
 | ![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/max31855.png) | [Adafruit MAX31855](https://www.adafruit.com/product/269) or [Adafruit MAX31856](https://www.adafruit.com/product/3263) | Thermocouple breakout board |
 | ![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/k-type-thermocouple.png) | [Thermocouple](https://www.auberins.com/index.php?main_page=product_info&cPath=20_3&products_id=39) | Invest in a heavy duty, ceramic thermocouple designed for kilns. Make sure the type will work with your thermocouple board. Adafruit-MAX31855 works only with K-type. Adafruit-MAX31856 is flexible and works with many types, but folks usually pick S-type. |
 | ![Image](https://github.com/jbruce12000/kiln-controller/blob/master/public/assets/images/breadboard.png) | Breadboard | breadboard, ribbon cable, connector for pi's gpio pins & connecting wires |