Adding visual helpers to the AR Prompt

Our plan is for the user to capture an image of his flat tire and then register augmented graphics to the captured image target. We are not so advanced as to have artificial intelligence (AI) image recognition (sorry, that's beyond the scope of this book), so we're going to rely a little bit on our user to choose a capture that's approximately the right position and size for our illustrations. Therefore, we need to provide some visual helpers to guide the user.

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