`MessageBird.Net.RestClient`: Refactored `PerformRoundTrip` logic out of methods `Retrieve` and `Create`. Added `GetEncoding` example as a start point to fix handling of response encoding (which is called `CharacterSet` in http terms).
`MessageBird.Net.RestClient`: Refactored `PerformRoundTrip` logic out of methods `Retrieve` and `Create`. Added `GetEncoding` example as a start point to fix handling of response encoding (which is called `CharacterSet` in http terms).

messagebird/csharp-rest-api