Add DNS Proxy (AdGuard) to recommended encrypted DNS proxies

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A simple DNS proxy server that supports all existing DNS protocols including DNS-over-TLS , DNS-over-HTTPS , DNSCrypt , and DNS-over-QUIC . Moreover, it can work as a DNS-over-HTTPS , DNS-over-TLS or DNS-over-QUIC server.

DNS Proxy is used within AdGuard Home, actively maintained, often receiving the latest features alongside AdGuard Home before any other AdGuard product, and is open source.

Homepage/Source Code: GitHub - AdguardTeam/dnsproxy: Simple DNS proxy with DoH, DoT, DoQ and DNSCrypt support
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