public IActionResult Save()
        {
            // Create the instance for the stream reader object
            using (var reader = new StreamReader(Request.Body))
            {
                // read the stream and store it
                var body = reader.ReadToEnd();

                // instantiate the save model and assign to his property JsonString the value of body
                SaveModel file = new SaveModel {
                    JsonString = body
                };

                // run saving method
                file.OnSet();
            }
            // return the ok status
            return(Ok("File was saved!"));
        }