update README/package.json for Tutor based development

[brian-smith-tcril]

We should update the README to document how to develop this MFE against tutor

Notes:

• https://github.com/overhangio/tutor-credentials?tab=readme-ov-file#learner-record-ui
• add dev script to package.json so npm run dev works (see other tutor-supported MFEs such as frontend-app-learning for examples)