Add indicator for earning rewards

[juliangruber]

As suggested by Dart:

Add an indicator light or button to show that the app is running and you are earning rewards. Currently, it's unclear
if it's "working" or not, especially coming in as a new user.

[HarshS1611]

Hey @juliangruber, I am a PLDG cohort contributor, I would like to work on this issue. Please specify the details of the indicator, like where you want this indicator to show or any other information I have to keep in mind.

[juliangruber]

Hey @HarshS1611 this issues requires UI work, which we aren't ready to accept from outside contributors yet. Could you please take another one?