conda-config: add page

[defnvary]

• 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 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) at commit
924ea89f5faa36188d98f57052be146b6e77a142:

pages/common/conda-config.md:21: TLDR008 File should contain no trailing whitespace

Please fix the error(s) and push again.

[Managor]

Read the style guide. This is not our syntax. https://github.com/tldr-pages/tldr/blob/main/contributing-guides/style-guide.md

[Managor]

Suggested change

	`conda config {{--show}} {{<setting_name>}}`
	`conda config --show {{setting_name}}`

[Managor]

Suggested change

	`conda config {{[--set|--remove]}} {{<key>}} {{<value>}}`
	`conda config {{--set|--remove}} {{key}} {{value}}`