Update README.md

[caetano1]

Update the readme to match the the vtex-apps template, and add the warning message that this is an unfinished app.

What problem is this solving?

How should this be manually tested?

N/A

Checklist/Reminders

• Updated README.md.
• Updated CHANGELOG.md.
• Linked this PR to a Jira story (if applicable).
• Updated/created tests (important for bug fixes).
• Deleted the workspace after merging this PR (if applicable).

Screenshots or example usage

Type of changes

✔️	Type of Change
_	Bug fix
_	New feature
_	Breaking change
_	Technical improvements

Notes

[vtex-io-ci-cd]

Hi! I'm VTEX IO CI/CD Bot and I'll be helping you to publish your app! 🤖

Please select which version do you want to release:

• Patch (backwards-compatible bug fixes)

• Minor (backwards-compatible functionality)

• Major (incompatible API changes)

And then you just need to merge your PR when you are ready! There is no need to create a release commit/tag.

• No thanks, I would rather do it manually 😞

[vtex-io-docs-bot]

Beep boop 🤖

Thank you so much for keeping our documentation up-to-date ❤️

[guerreirobeatriz]

I believe this info should be divided into different sections: Configuration and Modus Operandi. The Configuration section should teach users how to set up the app in their VTEX accounts and/or their store themes. In turn, the Modus Operandi section should contain further info regarding the app behavior i.e. how users should properly use it.

[caetano1]

The app is still under construction, and most probably it will become private.. It is really urgent to update the readme with the warning for now 🙏