Add a BSD licensed QR code library

resources/qr_code/README.md

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+phpQr - A QRCode encoder class
+===
+
+by Maik Greubel (greubel@nkey.de)
+
+The intention to create a basic qrcode encoder for PHP was a request on phpclasses.org.
+-
+
+The author studied multiple sources to get an idea how qrcode implementation works under the hood. 
+The best source was the JavaScript library jquery which provides a HTML Table based implementation.
+See source and documentation at  <https://github.com/jeromeetienne/jquery-qrcode>
+
+So the hard work was already done by Jerome Etienne. My part was only to port it to PHP code.
+
+Currently this package does not have the capability to read QRCodes.
+
+Further readings
+-
+For a detailed description of QRCode and its features please check  <http://www.qrcode.com/>
+
+Trademark information
+-
+
+QR Code is registered trademark of  
+DENSO WAVE INCORPORATED  <http://www.denso-wave.com/qrcode/faqpatent-e.html>
+
+License
+-
+All files in the package are published under the terms of the BSD 2 License.  <http://opensource.org/licenses/BSD-2-Clause>
+