Add Websockets section and initialize it with Socket.io

[mysticwillz]

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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This PR introduces a new "WebSockets" section to categorize libraries focused on real-time, event-driven communication. As the first addition to this section, I’ve included Socket.io.

Socket.io is well backed by strong community support, and has garnered thousands of stars on GitHub.

[mysticwillz]

@gokaygurcan Can you help merge this

[gokaygurcan]

Thanks