[Feature request] Add Adguard DNS to list of encrypted DNS providers

Add Adguard DNS to list of encrypted DNS providers. It supports DOT (tls://dns.adguard-dns.com) so this may be added in matter of minutes (?) as other DNS providers already using DOT in your firmware.

@alzhao please consider adding it :hugs:

You can add encrypted DNS in Adguard home with upstream setting.

Adguard Home is in DNScrypt-Proxy already.

Thank you for your response!

I meant into DNS over TLS settings:)

OK I understant. But we are not touching this at this moment.

OK. Can I ask why?

First Adguard DNS can be used as DNScrypt-proxy.
Second, there are tasks in higher priority.