Create comments.md under postgresql

[thiennguyen93]

Description

Issue Solved

Type of Change

• Adding a new entry
• Editing an existing entry (fixing a typo, bug, issues, etc)
• Updating the documentation

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[thiennguyen93]

CLA has been signed. However, license/cla is still pending

[letsbuildanything]

@thiennguyen93, it appears that you've submitted this PR using two accounts. Therefore, please sign this CLA with both of your accounts, or alternatively, close this and resubmit a new PR using only a single account.

[thiennguyen93]

Everything is good know

[thiennguyen93]

@letsbuildanything Please help me review this one

[thiennguyen93]

@letsbuildanything Thank you for your code reviews. I have made some changes to fix all. Thank again.

[github-actions[bot]]

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