tshark: add page

[NargiT]

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

Special thanks to @jvns for here inspiring post https://twitter.com/b0rk/status/1091733136935923717

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

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

Error: Parse error on line 23:
...y fields to output `tshark -T fields -...
---------------------^
Expecting 'BACKTICK', got 'TEXT'
pages/linux/tshark.md:3: TLDR004 Command descriptions should end in a period
pages/linux/tshark.md:13: TLDR005 Example descriptions should end in a colon
pages/linux/tshark.md:21: TLDR005 Example descriptions should end in a colon

Please fix the error(s) and push again.

[NargiT]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
You have signed the CLA already but the status is still pending? Let us recheck it.

waiting an answer from @jvns before to accept the CLA

[NargiT]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
You have signed the CLA already but the status is still pending? Let us recheck it.

waiting an answer from @jvns before to accept the CLA

Done -> https://twitter.com/b0rk/status/1093143505281658881

[mebeim]

Hi @NargiT, thank you for your contribution! tshark is a super useful command. I've left some comments for you to review.

[NargiT]

I think I merge/fixed all the changes let me know if it's ok

[mebeim]

Looking fine to me 👍 Thanks again.