public void addFile(String fileName, String content) {
    FileResultModel fileModel = new FileResultModel(fileName, content);
    files.add(fileModel);
  }
@param fileName only the name part of the file, no directory infomation
@param content the content to be saved to the file
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/result/model/ResultModel.java