feat: add new icon for Umbral

[hersac]

Description

This PR adds the official icon support for Umbral, a low-level programming language focused on performance and simplicity.

More info about the language: https://github.com/hersac/umbral

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[PKief]

Thanks a lot for your contribution and for taking the time to share your project. From what I can see in the GitHub repository, the language adoption is still quite small at the moment, and it appears that the project is primarily used by you (or possibly a very limited number of others).

In situations like this, the recommended approach is usually to define a custom SVG icon and configure your local VS Code instance to use it. This allows you to have the icon exactly as you want it without requiring it to be included in the main icon theme. You can find a detailed explanation here:

https://github.com/material-extensions/vscode-material-icon-theme?tab=readme-ov-file#custom-svg-icons

Please let me know if this solution would work for you. I hope you understand that we’re not able to add logos for every personal or early-stage project, as this would quickly make the icon extension very large, with many icons that are only relevant to a small number of users.

[hersac]

Thank you so much for the clarification. I hope it will be possible sometime in the future. Although it's uncertain, I hope to see you again.