Add a BSD licensed QR code library

resources/qr_code/QRByte.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * This file is part of the phpQr package
+ *
+ * See @see QRCode class for description of package and license.
+ */
+
+/**
+ * Import necessary dependencies
+ */
+require_once 'QRBitBuffer.php';
+
+/**
+ * This interface describes a QRByte implementation
+ * 
+ * @author Maik Greubel <greubel@nkey.de>
+ * @package phpQr
+ */
+interface QRByte
+{
+  /**
+   * Retrieve the mode
+   * 
+   * @return  int The mode
+   */
+  public function getMode();
+  
+  /**
+   * Retrieve the length
+   * 
+   * @return int The length
+   */
+  public function getLength();
+  
+  /**
+   * Write data to byte
+   * 
+   * @param QRBitBuffer $buffer The data to write into byte
+   */
+  public function write(QRBitBuffer $buffer);
+}