New document - Pound proxy server

[sspencerwire]

• checked instructions and document for readability
• checked for spelling issues and corrected
• checked grammar usage and sentence structure - there may be some edits
  needed
• checked all of the instructions for technical correctness, including
  those dealing with the firewalld instructions
• checked the functions of Pound, both with and without the firewall
  services running
• provided screenshots where needed

Author checklist (Completed by original Author)

• Contribution a good fit for the Rocky project? Title and Author MetaTags inserted ?
• Is this a non-English contribution?
• If applicable, steps and instructions have been tested to work on a real system
• Did you perform an initial self-review to fix basic typos and grammatical correctness

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Check that document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Basic Editorial Review)
• 4th Pass (Detailed Editorial Review and Peer Review)
• Final pass/approval (Final Review)

[sspencerwire]

I think this is pretty clean, but it may need some editing.