message: Add XML support for CS Fluent generator
diff: @@ -109,6 +109,13 @@ namespace AutoRest.CSharp.Azure.Fluent
  await Write(exceptionTemplate, Path.Combine(Settings.Instance.ModelsName,
  $"{exceptionTemplate.Model.ExceptionTypeDefinitionName}{ImplementationFileExtension}"));
  }
  +
  + // Xml Serialization
  + if (codeModel.ShouldGenerateXmlSerialization)
  + {
  + var xmlSerializationTemplate = new XmlSerializationTemplate { Model = null };
  + await Write(xmlSerializationTemplate, Path.Combine(Settings.Instance.ModelsName, $"{XmlSerialization.XmlDeserializationClass}{ImplementationFileExtension}"));
  + }
  }
  }
  }
  