I²C and Protocol documentation

[NoeelMoeskops]

Added documentation.

More is to come:

• file restructuring to separate header and source files.
• I also read that you wanted to compile the lib separately in a .so or .a file. I could look into that as well.
• I was also thinking of adding an I²C discovery functionality like that exists on the Raspberry Pi. But I will create its own issue for that :).

Also, I will be writing a BME280 driver shortly. And I am planning to use this tool a lot to figure out how the chip works. It will be a good bug test and to see if everything is working correctly and if we are not missing some features etc.

[stephendpmurphy]

Awesome - Thanks @NoeelMoeskops

p.s. take a look at this - https://github.com/BoschSensortec/BME280_driver/tree/c47f06eb44fc96970f0abfcc941ec16425b2a9e6

I've actively used it in another project and the driver is super easy to integrate and use.