Add coalsticks to Contributors list and cli tutorial PT-BR translation

[coalsticks]

I created a pt-br version to the GitHub CLI tutorial, and added my username to the contributors list.

[github-actions[bot]]

Thank you for your pull request. This pull request contains changes in files which requires review. The following files were changed:

• Contributors.md
• cli-tool-tutorials/github-cli-tutorial-pt-br.md

[coalsticks]

If your PR addresses multiple problems, please open two separate Pull Requests next time.

Got it! Must I close this pull request and reopen two more?

[StackOverflowIsBetterThanAnyAI]

I think you are fine for this one, but if you want to, you can also close this one and open two separate Pull Requests.

[coalsticks]

Ok! Thank you :)

[Roshanjossey]

Hello, congratulations! You've successfully submitted a pull request. 🎉

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