Add Encrypted DNS providers table (#1097)

* Add ICANN DNS providers table

* Iterate on feedback

* Iterate on feedback

* Protocol sorting hack

* Add Cloudflare warning

* Update descriptions, add DNS-over-Tor description

* Update Cloudflare URL

* Remove DNS-over-Tor refs for now

* Update table description

* Update source_code.md

* Some cleanup

* Add link to CloudFlare's privacy policy

* Update table description

* Use Yes/No for consistency with other tables

* Update source_code.md

* Update Cloudflare URL

* Update table description

* Update CZ.NIC data value

* Update DNSCrypt grammatical error

* Add DNSCloak and Stubby to source_code.md

* Add comment to clarify data value

source_code.md

@@ -258,21 +258,40 @@ Backend: closed-source
    GNU Social: https://gnu.io/source/
 
 ## Domain Name System (DNS)
- Njalla: Non-free/Proprietary Software
 
- DNSCrypt: https://github.com/dnscrypt
+Njalla: Non-free/Proprietary Software
+
+DNSCrypt: https://github.com/dnscrypt
+
 DNSCrypt-proxy: https://github.com/jedisct1/dnscrypt-proxy/
 
- OpenNic: https://github.com/opennic/ (mostly)
+OpenNic: https://github.com/opennic/ (mostly)
+
 Webpage: https://github.com/opennic/opennic-web
 
-  Worth Mentioning
+### Worth Mentioning
 
-   NoTrack: https://github.com/quidsup/notrack
+- NoTrack: https://github.com/quidsup/notrack
 
-   Namecoin: https://github.com/namecoin
+- Namecoin: https://github.com/namecoin
 
-   Pi-hole: https://github.com/pi-hole
+- Pi-hole: https://github.com/pi-hole
+
+## Encrypted ICANN DNS Providers
+
+AdGuard DNS: https://github.com/AdguardTeam/AdGuardDNS/
+
+BlahDNS: https://github.com/ookangzheng/blahdns/
+
+CloudFlare DNS: https://github.com/cloudflare/dns
+
+PowerDNS: https://github.com/PowerDNS/pdns
+
+### Worth Mentioning and Additional Information
+
+- DNSCloak: https://github.com/s-s/dnscloak
+
+- Stubby: https://github.com/getdnsapi/stubby
 
 ## Digital Notebook
  Joplin: https://github.com/laurent22/joplin