Add Typescript Category & first initial snippet.

[px-d]

Description

Added Typescript Category & added a first snippet.

Type of Change

• ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe): Added new Category

Checklist

• I have tested my code and verified it works as expected.
• My code follows the style and contribution guidelines of this project.
• Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

I added the first snippet which I found to be very useful in some small cases. It's a bit niche so I understand it might not fit the project too well.

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[Mathys-Gasnier]

Thanks for the contribution, it looks great ! Could you just rename the snippet file to match the title of the snippet (it's missing the s on types)