Updated README file

README.rst

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+MFRC522
+=======
+
+Arduino library for MFRC522 and other RFID RC522 based modules.
+
+Read and write different types of Radio-Frequency IDentification (RFID) cards
+on your Arduino using a RC522 based reader connected via the Serial Peripheral
+Interface (SPI) interface.
+
+
+.. _pin layout:
+
+Pin Layout
+----------
+
+The following table shows the typical pin layout used:
+
++-----------+---------+-----------------------------+
+|           | PCD     | Arduino                     |
+|           +---------+---------+---------+---------+
+|           | MFRC522 | Uno     | Mega    | Nano v3 |
++-----------+---------+---------+---------+---------+
+| Signal    | Pin     | Pin     | Pin     | Pin     |
++===========+=========+=========+=========+=========+
+| RST/Reset | RST     | 9 [1]_  | 5 [1]_  | D9      |
++-----------+---------+---------+---------+---------+
+| SPI SS    | SDA     | 10 [2]_ | 53 [2]_ | D10     |
++-----------+---------+---------+---------+---------+
+| SPI MOSI  | MOSI    | 11      | 52      | D11     |
++-----------+---------+---------+---------+---------+
+| SPI MISO  | MISO    | 12      | 51      | D12     |
++-----------+---------+---------+---------+---------+
+| SPI SCK   | SCK     | 13      | 50      | D13     |
++-----------+---------+---------+---------+---------+
+
+.. [1] Configurable, typically defined as RST_PIN in Sketch.
+.. [2] Configurable, typically defined as SS_PIN in Sketch.
+
+
+Hardware
+--------
+
+There are three hardware components involved:
+
+1. **Micro Controller**:
+
+* An `Arduino`_ or compatible executing the Sketch using this library.
+
+* Prices vary from USD 7 for clones, to USD 75 for "starter kits" (which
+  might be a good choice if this is your first exposure to Arduino;
+  check if such kit already includes the Arduino, Reader, and some Tags).
+
+2. **Proximity Coupling Device (PCD)**:
+
+* The PCD is the actual RFID **Reader** based on `NXP MFRC522`_ Contactless
+  Reader Integrated Circuit).
+
+* Readers can be found on `eBay`_ for around USD 5: search for *"rc522"*.
+
+* You can also find them at several web stores, they are often included in
+  *"starter kits"*; so check your favourite electronics provider as well.
+
+3. **Proximity Integrated Circuit Card (PICC)**:
+
+* The PICC is the RFID **Card** or **Tag** using the `ISO/IEC 14443A`_
+  interface, for example Mifare or NTAG203.
+
+* One or two might be included with the Reader or *"starter kit"* already.
+
+
+Protocols
+---------
+
+1. The micro controller and the reader use SPI for communication.
+
+* The protocol is described in the `NXP MFRC522`_ datasheet.
+
+* See the `Pin Layout`_ section for details on connecting the pins.
+
+2. The reader and the tags communicate using a 13.56 MHz electromagnetic field.
+
+* The protocol is defined in ISO/IEC 14443-3:2011 Part 3.
+
+  * Details are found in chapter 6 *"Type A – Initialization and anticollision"*.
+
+  * See http://wg8.de/wg8n1496_17n3613_Ballot_FCD14443-3.pdf for a free version
+    of the final draft (which might be outdated in some areas).
+
+
+History
+-------
+
+The MFRC522 library was first created in Jan 2012 by Miguel Balboa (from
+http://circuitito.com) based on code by Dr. Leong (from http://B2CQSHOP.com)
+for *"Arduino RFID module Kit 13.56 Mhz with Tags SPI W and R By COOQRobot"*.
+
+It was translated into English and rewritten/refactored in the fall of 2013
+by Søren Thing Andersen (from http://access.thing.dk).
+
+
+.. _arduino: http://arduino.cc/
+.. _ebay: http://www.ebay.com/
+.. _iso/iec 14443a: http://en.wikipedia.org/wiki/ISO/IEC_14443
+.. _iso/iec 14443-3\:2011 part 3: 
+.. _nxp mfrc522: http://www.nxp.com/documents/data_sheet/MFRC522.pdf