Add csharp complex generator example

In tutorial we have sample for genarator of IpAddress

```fsharp
open System.Net
let ipAddressGen : Gen = gen {
let! addr = Range.constantBounded () |> Gen.byte |> Gen.array (Range.singleton 4)
return System.Net.IPAddress addr
}
```

Anybody could check my translation to csharp? It is'nt idiomatic csharp IMHO

```csharp
var byteRange = Range.ConstantBoundedByte();
var byteGen = Gen.Byte(byteRange);
var byteArrayGen = Hedgehog.Gen.array(Range.FromValue(4), byteGen);
var ipAddressGen = byteArrayGen.Select(bytes => new IPAddress(bytes));
```

May be it's suitable to add csharp.md with more examples?
Right now I try get how to use `Property.CounterExample`