[Feature]: What's new indicator & modal display

[janechu]

Feature Request

Summary

This feature is to facilitate communication, it will be a method by which all changelog items from the release are shown to any user accessing the app, determined by the last time the app was opened.

Examples

Requirements

• Store in localStorage information about when the user last visited the app
  • If this is the first time the user is accessing the app, do not show a "new" indicator
  • If there are new items since the user has last access the app, show a "new" indicator which when clicked will open the modal
• Determine how to break up releases into multiple json files that can be fetched dynamically so as not to bulk up the application for users
• Create a utility that scrapes the changelog.json for both @microsoft/fast-tooling and @microsoft/fast-creator and renders HTML in a modal, depending on design with multiple pages or scrolling to show multiple releases
• Trigger the modal via the button/anchor with the "new" indicator mechanism
• When the button/anchor with the "new" indicator mechanism is pressed, a list of previous updates should still be available and timestamped (?) which can be reviewed at any time

[janechu]

Closed by #67