Update and rename README to README.md

README.md

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+# WiringPi
+WiringPi is an implementation of most of the Arduino Wiring functions for the Raspberry Pi, this gem is a wrapper for the main wiringpi library and provides a nice OO interface with a few other handy helpers.
+
+## Installation
+Install with `gem install wiringpi2` or use bundler's Gemfile
+```
+source 'https://rubygems.org'
+
+gem 'wiringpi2' # https://github.com/WiringPi/WiringPi-Ruby
+```
+then: `bundle install`
+
+## Example
+```
+#!/usr/bin/env ruby
+
+require 'bundler'
+Bundler.setup
+Bundler.require
+
+io = WiringPi::GPIO.new do |gpio|
+  gpio.pin_mode(0, WiringPi::OUTPUT)
+  gpio.pin_mode(1, WiringPi::INPUT)
+end
+
+pin_state = io.digital_read(1) # Read from pin 1
+puts pin_state
+
+io.digital_write(0, WiringPi::HIGH) # Turn pin 0 on
+io.delay(100)                       # Wait
+io.digital_write(0, WiringPi::LOW)  # Turn pin 0 off
+```
+You will need to run your scripts as root because WiringPi accesses `/dev/mem`
+
+## Reference
+
+### Pins
+For a complete run-down see the [pins page](http://wiringpi.com/pins/) of the [wiringpi website](http://wiringpi.com/).
+![alt text](http://wiringpi.com/wp-content/uploads/2013/03/gpio1.png "The main GPIO connector")
+![alt text](http://wiringpi.com/wp-content/uploads/2013/03/gpio21.png "The secondary GPIO connector")
+
+### More
+Full details on the [wiringpi website](http://wiringpi.com/).