Update README.md

README.md

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 <h1 align="center" id="heading"> Pi-hole LXC </h1>
 
+[Pi-hole](https://pi-hole.net/) is a Linux network-level advertisement and Internet tracker blocking application which acts as a DNS sinkhole and optionally a DHCP server.
+
 To create a new Proxmox Pi-hole LXC, run the following in the Proxmox Shell.
 
 ```yaml