[FE] [Practice] display userBalance in a cell

[cupOJoseph]

Goal

Learn how to combine the frontend and backend in a Redwood app.

Deliverable

A frontend feature which fetches the user's balance from the backend and displays it to the user.

Suggested tasks

• Combine the work you did in [FE] [Practice] Create a Cell using rw generator to display a user's balance #1 and [BE] [Practice] Make a backend service to get a users balance of an erc20 token  #2 to display the user's balance on the home page, or in a layout which appears on every page.