I was thinking it might be worth creating a "walk through" of setting it up in AWS. Although using the library is as simple as putting in a CDN based tracking code, I believe the bulk of the work for setting up this library happens on the AWS side.
At minimum, it would be good to at least include a direct link to the pinpoint product right in the README file.
I've attached screenshots of the process that might be helpful to include in the README or documentation, even as a background, not necessarily the main instructions.
Generic "where to click" style screenshots:
This screen was particularly confusing:
AWS is giving alternative instructions, takes mental work to figure out which steps to include and which steps to ignore in order to use this library instead.
Also, I would change include a nice dashboard style screenshot in the README file as well, just to show people what's possible with AWS too: