Added the video for future reference

.gitattributes

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+*.webm filter=lfs diff=lfs merge=lfs -text

README.md

@@ -90,3 +90,5 @@ unprivileged: 1
 
 * [NFS: Overview and Gotchas](http://www.troubleshooters.com/linux/nfs.htm)
 * [How to setup NFS server and client](https://codeyarns.com/2013/03/17/how-to-setup-nfs-server-and-client/)
+
+file `video/proxmox_add_nfs.webm` is downloaded from [proxmox 添加 nfs 存储 完美解决 空间不足 虚拟机 备份 容灾 proxmox add nfs](https://www.youtube.com/watch?v=mroM6_koNdw)