taskset: add page

[lbonanomi]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform directory (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.

[tldr-bot]

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

Error: Parse error on line 7:
...--cpu-list {{{pid}}` `- Set a running 
-----------------------^
Expecting 'NEWLINE', 'TEXT', 'DASH', 'BACKTICK', got 'COMMAND_TEXT'
pages/linux/taskset.md:3: TLDR004 Command descriptions should end in a period
pages/linux/taskset.md:6: TLDR103 Command example is missing its closing backtick

Please fix the error(s) and push again.

[lbonanomi]

This PR is in support of #2214

[sbrl]

Thanks for the new page, @lbonanomi! I've left some comments below for you to review.