added arduino nfcReader files (#42)

Arduino/nfcReader/PN532/README.md

@@ -0,0 +1,30 @@
+## NFC library for Arduino
+
+This is an Arduino library for PN532 to use NFC technology.
+It works with
+
++ [NFC Shield](http://goo.gl/Cac2OH)
++ [Xadow NFC](http://goo.gl/qBZMt0)
++ [PN532 NFC/RFID controller breakout board](http://goo.gl/tby9Sw)
+
+### Features
++ Support I2C, SPI and HSU of PN532
++ Read/write Mifare Classic Card
++ Works with [Don's NDEF Library](http://goo.gl/jDjsXl)
++ Support Peer to Peer communication(exchange data with android 4.0+)
++ Support [mbed platform](http://goo.gl/kGPovZ)
+
+### Getting Started
+1. Download [zip file](http://goo.gl/F6beRM) and 
+extract the 4 folders(PN532, PN532_SPI, PN532_I2C and PN532_HSU) into Arduino's libraries.
+2. Downlaod [Don's NDEF library](http://goo.gl/ewxeAe) and extract it intro Arduino's libraries.
+3. Follow the examples of the two libraries.
+
+### To do
++ Card emulation
+
+### Contribution
+It's based on [Adafruit_NFCShield_I2C](http://goo.gl/pk3FdB). 
+[Seeed Studio](http://goo.gl/zh1iQh) adds SPI interface and peer to peer communication support. 
+@Don writes the [NDEF library](http://goo.gl/jDjsXl) to make it more easy to use. 
+@JiapengLi adds HSU interface.