collect feedback from users in the app

[Jeremy Jordan]

What's your idea?
We should provide a simple way to collect feedback from users.

Describe the solution you'd like
Ask two optional questions:

• "Do you think this prediction is correct?" – depending on the user response, we can add tags such as {classification:correct, classification:wrong, classification:unsure}
• "Do you know what breed this flower is?" – add the input as an image tag

Completing #52 should help provide users with enough information to make a judgement if they'd like.

We can also add top_k model predictions and a model ID as image tags, which would help provide additional context to the feedback.