DigitalWriteFast: added README about license and author

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Andrew Tridgell 2012-11-19 08:46:47 +11:00
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This implementation of DigitalWriteFast() and related functions is
based on the following code:
http://code.google.com/p/digitalwritefast/
This code is available under the GNU General Public License version 3,
and was originally written by johnraines24@gmail.com
The code was imported into APM by Randy Mackay and Andrew Tridgell