feat: add initial Portainer stack and template configurations for AdGuard Home

templates/adguard/README.md

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+# AdGuard Home (Portainer template)
+
+AdGuard Home is a network-wide software for blocking ads, trackers and unwanted content by acting as a DNS resolver with filtering capabilities. This template contains a ready-to-use configuration to deploy AdGuard Home as a Docker stack via Portainer.
+
+Quick notes:
+
+- Expose the DNS ports (`53/tcp` and `53/udp`) so your network devices can use AdGuard as a resolver.
+- Mount a persistent directory for configuration and DNS databases to preserve settings across container restarts.
+- Keep secrets (if any) out of this repository—use environment variables, Docker secrets, or Portainer credentials.
+
+Usage:
+
+1. Import the compose file or template into Portainer's Stacks/App Templates.
+2. Adjust the bind paths and ports to match your host and network.
+3. Deploy and point your devices or DHCP server to the AdGuard DNS address.
+
+Helpful links:
+
+- Official site: https://adguard.com/en/adguard-home/overview.html
+- Docs: https://github.com/AdguardTeam/AdGuardHome