Create basic code with i2c initialization

[andyd666]

See wiringPi on the internet. Write some explanation in a *.c file on the pins that will be used

[andyd666]

pi@NanoPi-NEO-Air:~/nanopi_max86150_ecg_ppg$ cat debug.txt
init_gpio: max86150_fd = 5
retval from init_gpio() - 0x1e # this is return from device 0x5e (MAX86150) register 0xff