Added readme.md files for both new DSPI demo sketches.

Author: EmbeddedMan

pic32/libraries/DSPI/examples/DSPI_Demo/README.md

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+DSPI_Demo Readme
+
+This demo sketch simply shows how to use multiple SPI ports
+on the same chipKIT board with the DSPI library.
+
+Setup:
+
+This sketch assumes that your chipKIT board has at least 3 SPI ports,
+and that each SPI port's MOSI is connected to its MISO. This 'loopback'
+configuration simply sends data out and receives it back in again. 
+
+Each of the three SPI ports is set to a different clock speed so that
+it is clear which is which on the logic analyzer trace.
+
+This sketch is set up for the Fubarino SD board, but it can easily 
+be adopted to any chipKIT board by changing the number of DSPI objects
+and the chip select pins (if necessary - it's fine to leave them
+at their default values too).
+
+Flow:
+
+Data is sent out DSPI0, then received back in DSPI0. That received
+data is then sent out DSPI1, received back in DSPI1, then that received
+data is sent out DSPI2, received back in DSPI2, then printed out
+to the USB serial port to the PC. If there are any errors, you will not
+see the proper printout in the serial monitor.
+
+Expected Output:
+
+You should see "55:AA:A5  55:AA:A5  55:AA:A5".

pic32/libraries/DSPI/examples/DSPI_Int_Demo/README.md

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+DSPI_Int_Demo Readme
+
+This demo sketch simply shows how to use multiple SPI ports
+on the same chipKIT board with the DSPI library, but doing the
+transfers at the same time using interrupts.
+
+Setup:
+
+This sketch assumes that your chipKIT board has at least 3 SPI ports,
+and that each SPI port's MOSI is connected to its MISO. This 'loopback'
+configuration simply sends data out and receives it back in again. 
+
+Each of the three SPI ports is set to a different clock speed so that
+it is clear which is which on the logic analyzer trace.
+
+This sketch is set up for the Fubarino SD board, but it can easily 
+be adopted to any chipKIT board by changing the number of DSPI objects
+and the chip select pins (if necessary - it's fine to leave them
+at their default values too).
+
+Flow:
+
+Three data output buffers and three data input buffers are created.
+Different data is sent out each SPI port, at different speeds.
+Each transaction is started at about the same time using interrupts
+(intTransfer()). The code then waits until all three transfers have
+completed, and prints out the data received from each port.
+
+Expected Output:
+
+You should see "11:22:33  44:55:66  77:88:99".