Add sdns to Networking (#4958)

* Add sdns to Networking

* update description

README.md

@@ -2003,6 +2003,7 @@ _Libraries for working with various layers of the network._
 - [publicip](https://github.com/polera/publicip) - Package publicip returns your public facing IPv4 address (internet egress).
 - [quic-go](https://github.com/lucas-clemente/quic-go) - An implementation of the QUIC protocol in pure Go.
 - [raw](https://github.com/mdlayher/raw) - Package raw enables reading and writing data at the device driver level for a network interface.
+- [sdns](https://github.com/semihalev/sdns) - A high-performance, recursive DNS resolver server with DNSSEC support, focused on preserving privacy.
 - [sftp](https://github.com/pkg/sftp) - Package sftp implements the SSH File Transfer Protocol as described in <https://filezilla-project.org/specs/draft-ietf-secsh-filexfer-02.txt>.
 - [ssh](https://github.com/gliderlabs/ssh) - Higher-level API for building SSH servers (wraps crypto/ssh).
 - [sslb](https://github.com/eduardonunesp/sslb) - It's a Super Simples Load Balancer, just a little project to achieve some kind of performance.