Add pion

[megheaiulian]

Checklist:

• I've read and understood Contributing Guidelines.
• I've added the new resource at the end of its section.
• This resource is out there for a while, and actively maintained.
• This resource is popular enough and has at least a few hundred stars on GitHub.

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pion brings React's Hooks API to standard web components, using lit-html for
templating. It's an actively maintained continuation of the ideas from haunted
(same core lineage), with full TypeScript support and docs at https://pionjs.com
(npm: @pionjs/pion). The project has been steadily growing and is used in
production by teams preferring platform primitives over framework lock-in.

[gokaygurcan]

Thanks.