Write-up on the PF set prio option

[Justin Noor]

Hello community,

I wrote some documentation about PF's 'set-prio' option, which is a
quick-and-easy form of traffic shaping. It might be a good addition to
Chapter 30 of the handbook on firewalls. Please let me know what you think.
It's on my Github.

https://github.com/justinnoor/freebsd-handbook-pf-prio

<https://github.com/justinnoor/freebsd-handbook-pf-anchors>
Thank you,

Justin Noor