File lists on disk

[Jialin Qiao]

Hi,


I submitted a PR [1] to summarize the files on disk.


Please add into it if I miss some.


[1] https://github.com/apache/incubator-iotdb/pull/1541

Thanks,
--
Jialin Qiao
School of Software, Tsinghua University

乔嘉林
清华大学 软件学院