Update README.md

add instruction

misc/copy-data/README.md

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-<h2><p align="center">Copy data to another LXC</p></h2>
+<h2><p align="center">Copy data to another LXC (run in the Proxmox Shell)</p></h2>
 <div align="center"> To copy data from Home Assistant Container to Home Assistant Container </div>
 
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