Adds new plugin [davet2001/energy-sankey]

[davet2001]

Checklist

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

Links

Link to current release: https://github.com/davet2001/energy-sankey/releases/tag/v0.0.7
Link to successful HACS action (without the ignore key): https://github.com/davet2001/energy-sankey/actions/runs/11603264239
Link to successful hassfest action (if integration): N/A

Side note: I'm not sure why the diff has highlighted a change to the closing ']'. That was not intentional.

[hacs-bot]

The submitted name davet2001/homeassistant-energy-sankey-card does not match what GitHub returns for the repository (davet2001/energy-sankey).