zoneadm: add page

[osmium1]

Adds documentation page for Oracle Solaris zone administration.

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known): Oracle Solaris 11
• Reference issue: Reach parity with cheat cheatsheets #3689

[ivanbaluta]

Will these examples work without sudo/pfexec?

[osmium1]

Will these examples work without sudo/pfexec?

Yes, they need root - I'll add sudo to the commands that require it (everything except list).