virtio-fs: add Documentation/filesystems/virtiofs.rst

Add information about the new "virtiofs" file system.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9cbcf16..953e8c6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17117,6 +17117,18 @@
 F:	drivers/s390/virtio/
 F:	arch/s390/include/uapi/asm/virtio-ccw.h
 
+VIRTIO FILE SYSTEM
+M:	Vivek Goyal <vgoyal@redhat.com>
+M:	Stefan Hajnoczi <stefanha@redhat.com>
+M:	Miklos Szeredi <miklos@szeredi.hu>
+L:	virtualization@lists.linux-foundation.org
+L:	linux-fsdevel@vger.kernel.org
+W:	https://virtio-fs.gitlab.io/
+S:	Supported
+F:	fs/fuse/virtio_fs.c
+F:	include/uapi/linux/virtio_fs.h
+F:	Documentation/filesystems/virtiofs.rst
+
 VIRTIO GPU DRIVER
 M:	David Airlie <airlied@linux.ie>
 M:	Gerd Hoffmann <kraxel@redhat.com>