* add cs files

* add csproj

* resolve some feedbacks

* MSBuild fail

* derive from UnixDriver

* reference source files

* reference csproj

* resolve some issues

* using GpioController

* _interruptController is assigned a value in the constructor

* _interruptController nullable type

* nullable check

* SunxiDriver instead of inheriting SysFsDriver; add samples

* add readme; update samples

* add pin mode check; add static to _pinNumberConverter

* call initialize in constructor

* update README.md

* fix init problem; add some validates

* add Orange Pi Lite driver

* clean up; fix cpux-port initial problem; remove internal exceptions

* remove tiny delay

* private opi zero _pinNumberConverter

* add xml comment

* update README.md

* fix error SA1208

* fix copyright headers

* cleanup

* fix error SA1028

* fix CPUX port offset

* count the number of pins; update README.md

* fix typo

* Fix Interop duplication
Co-authored-by: NJose Perez Rodriguez <joperezr@microsoft.com>