Feature request: introduce `Acolyte.CSharp.StateMachine` NuGet package

[Vasar007]

Is your feature request related to a problem? Please describe.
One of the popular pattern — state machine. It will be useful if our package will contain it.

Describe the solution you'd like
I have already implemented state machine here.

Describe alternatives you've considered
None.

Additional context
Do not forget to add tests for new package.