Badge request: Particle Library installs

Goal is to add an installs badge to display the number of downloads/installs for particle.io libraries. The API endpoint is [here][1] and requires authentication via a personal access-token.

I'd like to take a stab at it but am not sure how to really integrate/require credentials. I think there is a tutorial somewhere, or I'll dive into the source on one of the other badges that requires them. Any help/input would be appreciated!

[1]: https://docs.particle.io/reference/api/#get-library-details

Start with the Particle library details API documentation linked in the issue, then inspect existing badges that require credentials to understand how personal access tokens are integrated. The work is done when the Particle library badge retrieves and displays the install count using authenticated requests.

Written by the indexing model from the issue text.