docs: improve project readme format

[mariajgrimaldi]

Description

This PR updates the README file adding more info about the plugin.

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
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Please let us know once your PR is ready for our review and all tests are green.

[mariajgrimaldi]

Should we adopt the readme standard for the openedx maintained repositories? https://open-edx-proposals.readthedocs.io/en/latest/processes/oep-0055/decisions/0003-readme-specification.html

[openedx-webhooks]

@mariajgrimaldi 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[itsjeyd]

label: core contributor