Add Shelly 3EM.

[kpfleming]

No description provided.

[netlify]

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[tekmaven]

This looks ready to me, but is marked as a Draft. Are there any other changes you were going to make? If yes, one option is that we can accept this and you can make future PRs to update the page.

[kpfleming]

I'll leave it 'draft' until the ade7880 component has been included in an EPSHome release. It's waiting for its first review, so it could be some time before that happens.

[Habbie]

The relevant PR is esphome/esphome#5242 (and it is still open)

[kpfleming]

The code has been merged into ESPHome 'dev' for the next release, so this can be merged at any time.