Create CI/CD cheatsheet

[EbonyAdder]

Thank you for submitting a Pull Request (PR) to the Cheat Sheet Series.

:triangular_flag_on_post: If your PR is related to grammar/typo mistakes, please double-check the file for other mistakes in order to fix all the issues in the current cheat sheet.

Please make sure that for your contribution:

• [x] In case of a new Cheat Sheet, you have used the Cheat Sheet template.
• [x] All the markdown files do not raise any validation policy violation, see the policy.
• [x] All the markdown files follow these format rules.
• [x] All your assets are stored in the assets folder.
• [x] All the images used are in the PNG format.
• [x] Any references to websites have been formatted as [TEXT](URL)
• [x] You verified/tested the effectiveness of your contribution (e.g., the defensive code proposed is really an effective remediation? Please verify it works!).
• [ ] The CI build of your PR pass, see the build status here.

This PR covers issue #1262.

This is just my initial pass; definitely welcome feedback. Thanks.

[EbonyAdder]

Thanks much for the kind words and feedback @szh . I believe I incorporated all your suggestions (please let me know if I overlooked any) and fixed a few other minor things. I will mark as ready for review. Thanks again.

[EbonyAdder]

Thanks again @szh . It has been updated.