Adding UnixI2cDevice Implementations

* rename arduino-demo and add video and picture

* Save README.md

* Update README.md

* change layout (resize, replace yt link, move)

* resize and compress picture (from 15MB to 500kB)

* Fix build

* Use dotnet account for video

Adding Eventing methods to the Unix Driver for Gpio

* Implement the Windows I2C device

* Implement the Windows SPI device

Removing the register address parameter from the read/write methods of SPI and I2C as these aren't general (#41)

- Create a maintainable GpioRunner test sample
- Fix spelling caught in PR

Added RPi detection for Windows. Moved linux detection constants out of the primary GpioController.cs file.

Adding Api feedback for I2C and SPI

* Initial implementation of Windows10Driver

Adding new changes for Yml that will take care of pushing packages to myget for official builds (#35)

* Moving Code to the new Api after the ApiReview

* PR Feedback

* Add arduino demo

* Fixing the build

* Excluding project from restore

* Update README.md

* Update Program.cs

* Create uart-demo.ino

* Update Program.cs

* Update arduino-demo.csproj

* Generate nuget package for System.Device.Gpio

* Refactoring properties and project files and addresing feedback

* More PR feedback

* Migrating to build.proj instead of solution file

* Adding the crossTargeting for different RIDs

* PR Feedback

Change GpioDriver to be an interface and inital implementation of UnixDriver

* Adding Licensing headers to our .cs files

* Moving files to the System.Device.Gpio namespace

* Adding Hardware PWM for Unix Driver

* Adding comments to sample pwm project

* PR Feedback

Updating CLI's version