feat: add AI Frameworks section and VoltAgent

[omeraplak]

Checklist:

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

---

VoltAgent is a new open-source framework for building AI agents in TypeScript.

It helps developers structure multi-agent systems with clear separation of logic, built-in observability, and native support for memory, tool calls, and external models like OpenAI and Anthropic.

The project is actively maintained and built by the creators of Refine (30K+ stars). Even though VoltAgent is early, it’s already gaining traction and filling a real gap in the JavaScript ecosystem for agent-based AI development.

We believe this addition will be valuable to developers exploring the intersection of JS and AI workflows.

Thank you! ⚡️