add description for distributed file systems categoryy

README.md

@@ -906,6 +906,8 @@ _Related: [Groupware](#groupware)_
 
 **[`^        back to top        ^`](#)**
 
+Network distributed filesystems.
+
 **Please visit [awesome-sysadmin/Distributed Filesystems](https://github.com/awesome-foss/awesome-sysadmin#distributed-filesystems)**