Add SparkFun AVR boards

Author: dmadison

README.md

@@ -40,9 +40,12 @@ To function as an XInput device, you *must* use a compatible boards package with
 
 The following boards packages are available:
 
-* #### [Arduino AVR Boards](https://www.github.com/dmadison/ArduinoXInput_AVR)
+* #### [Arduino AVR Core Boards](https://www.github.com/dmadison/ArduinoXInput_AVR)
   Modifies the Arduino AVR core to emulate an XInput device. Includes support for the Arduino Leonardo, Micro, Yun, and more. 
 
+* #### [SparkFun AVR Boards](https://www.github.com/dmadison/ArduinoXInput_SparkFun)
+  Provides support for the MaKey MaKey, Pro Micro, Fio, Qduino Mini, and LilyPad USB Plus. Requires the XInput AVR Core boards.
+
 * #### [Teensy 3 Boards](https://www.github.com/dmadison/ArduinoXInput_Teensy)
   Includes an 'XInput' USB mode for the Teensy 3.1, 3.2, 3.5, 3.6, and LC microcontrollers. Requires a preexisting Teensyduino installation.
 

extras/SupportedBoards.md

@@ -16,6 +16,16 @@ Here is a complete list of all of the currently supported boards. Each header li
 * [LilyPad Arduino USB](https://www.sparkfun.com/products/12049)
 * [Linino One](https://store.arduino.cc/usa/linino-one)
 
+## [SparkFun AVR Boards](https://github.com/dmadison/ArduinoXInput_Sparkfun)
+(Note: requires the XInput AVR core)
+
+* [MaKey MaKey](https://www.sparkfun.com/products/11511)
+* [Pro Micro 3.3V](https://www.sparkfun.com/products/10999)
+* [Pro Micro 5V](https://www.sparkfun.com/products/11098)
+* [Fio v3](https://www.sparkfun.com/products/11520)
+* [Qduino Mini](https://www.sparkfun.com/products/13614)
+* [LilyPad USB Plus](https://www.sparkfun.com/products/14346)
+
 ## [Teensy 3 Boards](https://github.com/dmadison/ArduinoXInput_Teensy/)
 
 * [Teensy 3.6](https://www.pjrc.com/store/teensy36.html)