wikiman: add page

[jpnadas]

• 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):

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/wikiman.md:
Error: Parse error on line 17:
...]ources:`wikiman``-s {{{source1}},{{so
---------------------^
Expecting 'NEWLINE', 'TEXT', 'DASH', 'BACKTICK', got 'COMMAND_TEXT'
pages/common/wikiman.md:5: TLDR011 Page never contains more than a single empty line
pages/common/wikiman.md:16: TLDR014 Page should contain no trailing whitespace

Please fix the error(s) and push again.

[spageektti]

Hi. Thank you so much for your contribution

[jpnadas]

Hi. Thank you so much for your contribution

@spageektti if it looks good for you, could you approve it?

[spageektti]

LGTM after this suggestion

[spageektti]

Can it be more than two?

Suggested change

	- Search for a topic on two specific [s]ources:
	`wikiman -s {{source1}},{{source2}} {{search_term}}`
	- Search for a topic on two or more specific [s]ources:
	`wikiman -s {{source1,source2,...}} {{search_term}}`