Add Angular Material to framework-wrappers.md

[alex737876]

As of version 15, Angular integrates official MDC Web components in Angular Material. This PR adds a single line of documentation to respect the work of Angular Material Team by adding them as only official MDC WEB integration to the list of integrated frameworks. Fixes #7991.

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.