Create vfs.md
Create vfs.md

Add VFS reference.
rancher/rancher-volume,rancherio/volmgr,rancherio/rancher-volume,aruneli/convoy,medallia/convoy,rancher/convoy,rancherio/rancher-volume,jinuxstyle/convoy,nickvanw/convoy,rancher/rancher-volume,rancherio/volmgr,medallia/convoy,medallia/convoy,rancherio/volmgr,nickvanw/convoy,aruneli/convoy,jinuxstyle/convoy,aruneli/convoy,rancher/rancher-volume,rancherio/rancher-volume,rancher/convoy,rancher/convoy,nickvanw/convoy,jinuxstyle/convoy