Adds new plugin [wrodie/mixer-card]

[wrodie]

Add new Audio mixer card

Checklist

• [x ] I've read the publishing documentation.
• [x ] I've added the HACS action to my repository.
• [ ] (For integrations only) I've added the hassfest action to my repository.
• [x ] The actions are passing without any disabled checks in my repository.
• [x] I've added a link to the action run on my repository below in the links section.
• [x ] I've created a new release of the repository after the validation actions were run successfully.

Links

Link to current release: https://github.com/wrodie/mixer-card/releases/tag/v0.1.5 Link to successful HACS action (without the ignore key): https://github.com/wrodie/mixer-card/actions/runs/7662307335/job/20883482418 Link to successful hassfest action (if integration): <>