feat/i2c: Add I2C wrapper functions

[DhruvaG2000]

• Tested with a custom example for ADXL345 which can be found here

• Follows latest licensing and directory structure

• uses ringBuffer

• TODO: Testing for multiple byte read/write

• TODO: Add i2c example if required

Signed-off-by: Dhruva Gole goledhruva@gmail.com

[DhruvaG2000]

For historical discussion on implementing i2c please refer: https://github.com/DhruvaG2000/Arduino-Core-Zephyr/pull/5

[alvarowolfx]

I tested this branch with the changes that I sent here using a BH1750 sensor and this library - https://github.com/claws/BH1750

The only change that I had to make to the BH1750 lib was to replace the Serial.println with printk statements as we don't support Serial yet.

[DhruvaG2000]

Outdated. Closing.