feat: added AI folder icon

[schart]

Hello, added a new folder icon for AI-related directories.
Folder names matched:

ai
.ai
artificial-intelligence

Icon source: Phosphor Icons — MIT License

Notice: I used AI for polish text.

[github-actions]

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[SayanShankhari]

hello, can we change half lobe (left or right) to binary indicator, as you are using brain icon, and AI is not fully brain, it's a simulation of brain.
-- just another idea 😄

[schart]

hello, can we change half lobe (left or right) to binary indicator, as you are using brain icon, and AI is not fully brain, it's a simulation of brain. -- just another idea 😄

That's a fun idea, Sayan I can update the icon to include a binary indicator if the maintainers are on board with the direction.

[PKief]

And if it should become a folder icon, it should also contain a folder right? 😅