Add welcome screen / onboard modal

[bhajneet]

Summary

On a new version there should be 1-3 new features being shared to the user to let them know what's changed and offer them a chance to consider using it themselves. If a user has done multiple version upgrades at once, we should also include a "release notes" button that takes them to a website.

In app example: https://www.google.com/search?q=welcome+new+version+update+apple (see images tab)

In app example:

Our figma mockup:

Website example: https://www.google.com/intl/en_US/chrome/whats-new/m123/

Approach

[ManpreetSL]

Questions and thoughts

• To start off, just figure out how to create a modal - look at how the settings menu works

• Then explore making the background of the modal darker so that the modal is the visual focus

• How is the app updated currently?

  • At that point, the current version can be stored locally (what's the OS equivalent of local storage?)
  • If there is a version that's already been stored, compare that to the new version number we've just updated to
  • Then send the old and new version numbers to a backend API to request back a list of the changes to show in the modal

• For now, since we don't have a backend API for this, I can simply create the modal and have it say 'you upgraded from version x to y!'

• How can I easily 'mock' installing a new version so that this can be tested?