tqdm: add examples

[BuonOmo]

• 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): v4.67.1

[Managor]

I think it's time to return to this PR now that a lot of things have been resolved.

[Managor]

We could use tar as the fourth example and use tricks to pipe stderr into stdout together to make it platform agnostic (not sure if 2>&1 or |& is available on all platforms).

Also it would be good if the description noted that it is platform agnostic.