the Priority of Task
置顶任务
QuickUp的tasks文件夹下的每个工作区都可能有一个priority.txt文件，如果没有，当这个工作区任意一个任务被添加星标后，这个文件就会被创建在该工作区。
这个文件里的每一行代表这个工作区里的标星文件，并且其顺序与QuickUp应用界面中的顺序相同。用户可以手动更改文件里的顺序，但是一定要谨慎。
About the Priority of Task
Each workspace under QuickUp tasks folder may have a priority.txt file. If there is no such a file, then the first click to the star-button of a task in this workspace will create this file.
The tasks in each line in this file will be placed at the top of the task-view in this workspace. The order of the top-pinned tasks is the order in this file.