nextdns: add DNS over HTTPS with NextDNS integration

Maintainer: @rs

Signed-off-by: Olivier Poitrey <rs@nextdns.io>

net/nextdns/files/nextdns.config

@@ -0,0 +1,21 @@
+config nextdns main
+    option enabled '1'
+
+    # NextDNS custom configuration id (create on on https://nextdns.io).
+    # If not defined, this package will act as a non-logging, non-filtering
+    # DNS over HTTPS resolver.
+    # option config abcdef
+
+    # Listen on a custom local port so a DNS front (like dnsmasq) can use us as
+    # a forwarder.
+    option listen '127.0.0.1:5342'
+
+    # Expose LAN clients information in NextDNS analytics.
+    option report_client_info '1'
+
+    # When enabled, use DNS servers located in jurisdictions with strong privacy laws.
+    # Available locations are: Switzerland, Iceland, Finland, Panama and Hong Kong.
+    option hardened_privacy '0'
+
+    # Log individual queries to system log.
+    option log_queries '0'