Badge Request: GitHub Container Registry

:clipboard: Description

GitHub recently introduced the GitHub Container Registry (see: https://github.blog/2020-09-01-introducing-github-container-registry/). It would be nice if there were badges available similar to those that shields has for Docker image version, image size, and pulls, but for the new GitHub Container Registry.

:link: Data

I'm not sure if GitHub has an API for this yet.

:microphone: Motivation

Motivation is the same as that of the equivalent badges that already exist for Docker Hub, but targeting the GitHub Container Registry instead. Providing a nice concise visual summary of some of the key statistics one might be interested in with a Docker image, but for images available in the GCR.