- add some code demos how to run the card

-the problem was just that the print commands already make the transfer too slow. then a buffer underrun happens

try to implement fifo mode. still some bug, it does not laod new data into the fifo memory and a memory underrun happens quickly

-trigger settings
-multiple tone replay

-fixed some bugs with the data transfer
-single frequency output in replay mode now works fine

- added first code and headers to test/run the card.