edison.md: Add notes on using i2c-1 w/Arduino breakout
edison.md: Add notes on using i2c-1 w/Arduino breakout

Closes #394

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

alext-mkrs/mraa,arunlee77/mraa,stefan-andritoiu/mraa,spitfire88/mraa,malikabhi05/mraa,KurtE/mraa,Jon-ICS/mraa,stefan-andritoiu/mraa-gpio-chardev,intel-iot-devkit/mraa,stefan-andritoiu/mraa,g-vidal/mraa,stefan-andritoiu/mraa,petreeftime/mraa,alext-mkrs/mraa,Jon-ICS/mraa,alext-mkrs/mraa,ProfFan/mraa,arfoll/mraa,malikabhi05/mraa,anonymouse64/mraa,Hbrinj/mraa,arfoll/mraa,yongli3/mraa,Pillar1989/mraa,spitfire88/mraa,arfoll/mraa,intel-iot-devkit/mraa,KurtE/mraa,intel-iot-devkit/mraa,anonymouse64/mraa,sergev/mraa,malikabhi05/mraa,sergev/mraa,whbruce/mraa,stefan-andritoiu/mraa-gpio-chardev,spitfire88/mraa,ncrastanaren/mraa,Jon-ICS/mraa,w4ilun/mraa,w4ilun/mraa,ncrastanaren/mraa,Hbrinj/mraa,andreivasiliu2211/mraa,jontrulson/mraa,Propanu/mraa,petreeftime/mraa,andreivasiliu2211/mraa,KurtE/mraa,Hbrinj/mraa,arfoll/mraa,KurtE/mraa,Pillar1989/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa,anonymouse64/mraa,Propanu/mraa,Propanu/mraa,g-vidal/mraa,jontrulson/mraa,Pillar1989/mraa,ProfFan/mraa,stefan-andritoiu/mraa-gpio-chardev,arunlee77/mraa,KurtE/mraa,jontrulson/mraa,spitfire88/mraa,stefan-andritoiu/mraa-gpio-chardev,ProfFan/mraa,petreeftime/mraa,arunlee77/mraa,malikabhi05/mraa,ncrastanaren/mraa,yongli3/mraa,whbruce/mraa,g-vidal/mraa,jontrulson/mraa,intel-iot-devkit/mraa,sergev/mraa,yongli3/mraa,sergev/mraa,jontrulson/mraa,sergev/mraa,w4ilun/mraa,arunlee77/mraa,alext-mkrs/mraa,petreeftime/mraa,Propanu/mraa,malikabhi05/mraa,whbruce/mraa,stefan-andritoiu/mraa,yongli3/mraa,Hbrinj/mraa,g-vidal/mraa,stefan-andritoiu/mraa-gpio-chardev,andreivasiliu2211/mraa,Propanu/mraa,w4ilun/mraa,yongli3/mraa,ncrastanaren/mraa,g-vidal/mraa,whbruce/mraa,alext-mkrs/mraa,intel-iot-devkit/mraa,ncrastanaren/mraa,arfoll/mraa,ProfFan/mraa