message: Add TfLiteVersion
diff: @@ -89,12 +89,20 @@ namespace TensorFlowLite
  tensor, tensorDataPtr, Buffer.ByteLength(outputTensorData)));
  }
  + public static string GetVersion() {
  + return Marshal.PtrToStringAnsi(TfLiteVersion());
  + }
  +
  private static void ThrowIfError(int resultCode) {
  if (resultCode != 0) throw new Exception("TensorFlowLite operation failed.");
  }
  #region Externs
  + [DllImport (TensorFlowLibrary)]
  + private static extern unsafe IntPtr TfLiteVersion();
  +
  +
  [DllImport (TensorFlowLibrary)]
  private static extern unsafe TfLiteInterpreter TfLiteModelCreate(IntPtr model_data, int model_size);
  