User Accounts: Store and load exercise settings

[Anish701]

As already implemented, users can open a settings modal on each exercise page to adjust feedback settings, such as target knee angle, target hip angle, etc. These settings values should be stored on the Firestore cloud database and be linked to each user. The values should be pulled from the database and should be updated whenever the user makes an update to them.

[jilinzheng]

Will you be creating a Firebase project and giving permissions to me and James to collaborate on the same project?

[Anish701]

Yes. You should have access now.

[jilinzheng]

Also add an user greeting/user-specific info when logged in, on the app menubar

[jilinzheng]

load happens when page first loads, not modal; also whenever user hits save and close, i.e. storing store happens when save and close is hit on modal if load does not get any valid data, use default