.NET: Workflow getting started samples in .Net (First batch) (#554)
* First batch of workflow getting started samples in .Net
* Add Switch Case Edge group
* Add multi selection group
* Add comments
* Add readme
* Fix formatting
* clean project file
* WIP: Revise sample structures
* Update readme
* Update readme
* Fix file encoding
* Update sample format
* Address comments
* Fix formatting
* Remove unwanted file
* Fix unit tests
* Remove unwanted file
Tao Chen