add link to pfsense docs on wireguard setup

README.md

@@ -1253,8 +1253,9 @@ For more details see the Further Reading: Docker section below.
 - https://www.wireguard.com/install/#installation
 - https://git.zx2c4.com/WireGuard/about/src/tools/man/wg.8
 - https://git.zx2c4.com/WireGuard/about/src/tools/man/wg-quick.8
-- https://wiki.archlinux.org/index.php/WireGuard
+- https://wiki.archlinux.org/index.php/WireGuard / https://wiki.archlinux.org/title/WireGuard
 - https://wiki.debian.org/Wireguard#Configuration
+- https://docs.netgate.com/pfsense/en/latest/vpn/wireguard/index.html
 
 ### Tutorials