multi-user support

[junjieim]

Specific Demand

can dufs support muti-user feature? so we can manage file by a admin account and guest can only download files.

I run dufs in docker. It seems like it can add different user:password with same kind of access control.

-A -a /@user:p -a /@user2:pp

thank you!

[junjieim]

-A -a /@user:p -a /sub/@user2:pp

And the user can login localhost:5000/ and user2 can only login localhost:5000/sub/.

I will close this issue but can @sigoden memtion this situation in README with further description?

Thank you for your dufs!