Added new XPLAIN serial Bridge project (thanks to John Steggall for the software UART code).

Projects/XPLAINBridge/XPLAINBridge.txt

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+/** \file
+ *
+ *  This file contains special DoxyGen information for the generation of the main page and other special
+ *  documentation pages. It is not a project source file.
+ */
+ 
+/** \mainpage XPLAIN UART Bridge Project
+ *
+ *  \section SSec_Compat Demo Compatibility:
+ *
+ *  The following list indicates what microcontrollers are compatible with this demo.
+ *
+ *  - AT90USB1287
+ *
+ *  \section SSec_Info USB Information:
+ *
+ *  The following table gives a rundown of the USB utilization of this demo.
+ *
+ *  <table>
+ *   <tr>
+ *    <td><b>USB Mode:</b></td>
+ *    <td>Device</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Class:</b></td>
+ *    <td>Communications Device Class (CDC)</td>
+ *   </tr>
+ *   <tr> 
+ *    <td><b>USB Subclass:</b></td>
+ *    <td>Abstract Control Model (ACM)</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Relevant Standards:</b></td>
+ *    <td>USBIF CDC Class Standard</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Usable Speeds:</b></td>
+ *    <td>Full Speed Mode</td>
+ *   </tr>
+ *  </table>
+ *
+ *  \section SSec_Description Project Description: 
+ *
+ *  This is a virtual serial port to soft-UART converter, for use on the Atmel XPLAIN boards. This project replaces the firmware
+ *  preloaded onto the XPLAIN's onboard AT90USB1287 microcontroller to act as a a UART-to-USB bridge between the device and the
+ *  host. When inserted, the device will enumerate as a regular COM port on the host, which can then be opened and data exchanged
+ *  between the XMEGA and Host as if the XMEGA was connected directly to the host's serial port.
+ *
+ *  After running this demo for the first time on a new computer, you will need to supply the .INF file located in this demo
+ *  project's directory as the device's driver when running under Windows. This will enable Windows to use its inbuilt CDC drivers,
+ *  negating the need for custom drivers for the device. Other Operating Systems should automatically use their own inbuilt CDC-ACM
+ *  drivers.
+ *
+ *  \section SSec_Options Project Options
+ *
+ *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
+ *
+ *  <table>
+ *   <tr>
+ *    <td><b>Define Name:</b></td>
+ *    <td><b>Location:</b></td>
+ *    <td><b>Description:</b></td>
+ *   </tr>
+ *   <tr>
+ *    <td>BUFF_STATICSIZE</td>
+ *    <td>RingBuff.h</td>
+ *    <td>Defines the maximum number of bytes which can be buffered in each Ring Buffer.</td>
+ *   </tr>
+ *  </table>
+ */