new ADC 16 bits - ADS8688a Library

Hello,

here is a link to my first published library. This is for a precision ADC from Texas Instrument the ADS8688a. The chip has 8 channels, 16bits resolution, 500 ksps, SPI, range selection, customizable alarm settings, 5v single supply and bipolar customizable input ranges.

Open hardware breakboard is also included.

++
Sylvain