Add shelly-alt icon

[tutomun]

Contribution Guidelines

• I have read and agree to the Contribution Guidelines

Icon Name

shelly-alt.png

Icon(s)

Note: this is an upscaled version of the original media asset provided by Shelly. No 512x512px exists:

https://info.shelly.cloud/media-assets/

[Bjorn Lammers]

Quality is too low. Feel free to re-open if you can provide a better one.