[ci skip] Update available commands & options in README

[dongskyler]

Fix #000 (<-- Add issue number here)

IMPORTANT: Each pull request (PR) should resolve an issue. Please create the issue if it hasn't been created, unless you're fixing typos or making minor changes to documentation or infrastructure. In that case, just leave the issue number as #000.

Details

If the PR title isn't enough to describe your PR, please provide details here.

This update on README is to reflect the features added in PR #4.

Checks

Make sure these boxes are checked before your PR is ready to be reviewed and merged. Thanks!

• PR is concisely and descriptively titled 📑 and links to the original issue 🔗.
• Code is in uniquely-named feature branch and has no merge conflicts 📁.
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR.
• @mentions of the person or team responsible for reviewing proposed changes. By default, use @BadwaterBay/reviewers.
• (Optional) Screenshots/GIFs are attached 📎 in case of UI updates.

We're happy to help you get this ready. Don't be afraid to ask for help, and don't be discouraged if your tests fail at first.

Thank you for contributing to this project!