Add installation instructions to README

Author: dmadison

README.md

@@ -4,11 +4,42 @@ This repository contains support for the following SparkFun Arduino-compatible d
 
 These boards are meant to be used in conjunction with the [ArduinoXInput library](https://github.com/dmadison/ArduinoXInput).
 
-#### AVR Boards
+## Included Boards
 
 * [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)
+
+## Installation
+<pre>
+└───Arduino Installation
+	├───drivers
+	├───examples
+	├───hardware
+	│   ├───arduino
+	│   ├───tools
+	│   ├───<b>xinput</b>
+	│   └───<b>xinput_sparkfun
+	│       └───avr
+	│           ├───bootloaders
+	│           ├───cores
+	│           ├───libraries
+	│           └───variants</b>
+	├───java
+	├───lib
+	├───libraries
+	├───reference
+	├───tools
+	└───tools-builder
+</pre>
+
+To install, you first need to install the latest version of the Arduino XInput AVR Core, [which can be found here](https://github.com/dmadison/ArduinoXInput_AVR). Follow [the installation instructions](https://github.com/dmadison/ArduinoXInput_AVR/#installation) provided in that repository and verify that those boards are installed correctly before proceeding.
+
+This boards package uses the same process for installation. Download [the latest version](../../releases/latest) of this repository to your PC. Navigate to the directory containing your Arduino installation, and then open up the 'hardware' folder. Extract the contents of the .zip file into this directory. You should have a new 'xinput_sparkfun' folder with an 'avr' folder inside of it, containing the files from this repository (see the tree view above).
+
+Restart the Arduino IDE. If the SparkFun boards are installed correctly, you should see a new collection of "SparkFun AVR Boards w/ XInput" in the `Tools -> Boards` menu.
+
+To uninstall, delete the 'xinput_sparkfun' folder in the 'hardware' directory, and then restart the Arduino IDE.