This project is currently at a very early stage, only basic features are available. HFS is a file server offering a powerful virtual file system (vfs). With this you don't need to expose a whole folder, but just a single file. Or you can change the name of files. Or many other things, without really touching the stuff on your hard disk. Both file browsing and back-end administration are performed through a web browser.
If you want to know more read this introduction.
Thanks JetBrains, Inc. for providing me with a free license of WebStorm to build this project.