pvesh, pct, pveversion: add page

[Managor]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• 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 title conforms to the recommended templates.
• Version of the command being documented (if known):

[Managor]

Just a draft. I will probably be using this in the coming weeks and will contribute my findings here

[Managor]

I do not know if the pct commands are valid. I followed this video, noticed they were almost identical to qm and coped qm.md

[Managor]

I was not able to find documentation for pveversion anywhere on the internet so I'll pull what I can from the Proxmox install

I wasn't able to find the source code even from the proxmox github repo.