initial check in based on SVN revision 575

doc/readme.txt

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+Overview
+========
+The spi_polling_board2board_master example shows how to use spi driver as master to do board to board transfer with 
+polling:
+
+In this example, one spi instance as master and another spi instance on othereboard as slave. Master sends a piece of
+data to slave, and receive a piece of data from slave. This example checks if the data received from slave is correct.
+
+Toolchain supported
+===================
+- IAR embedded Workbench  8.50.9
+- Keil MDK  5.33
+- MCUXpresso  11.3.0
+- GCC ARM Embedded  9.3.1
+
+Hardware requirements
+=====================
+- Micro USB cable
+- LPCXpresso54114 board
+- Personal Computer
+
+Board settings
+==============
+Populate jumper JP6.
+Connect SPI master on board to SPI slave on other board
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Master - SPI3
+Pin Name   Board Location
+MISO       J4 pin 3
+MOSI       J4 pin 2
+SCK        J4 pin 4
+PCS2       J4 pin 7
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Prepare the Demo
+================
+1.  Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J7) on the board
+2.  Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
+    - 115200 baud rate
+    - 8 data bits
+    - No parity
+    - One stop bit
+    - No flow control
+3.  Download the program to the target board.
+4.  Reset the SoC and run the project.
+
+Running the demo
+================
+When the demo runs successfully, the log would be seen on the CMSIS DAP terminal like:
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Master Start...!
+
+Succeed!
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~