Add promptshield CNAME entry

[mayank1513]

• There is reasonable content on the page (see: [No Content](https://github.com/js-org/js.org/wiki/No-Content))
• I have read and accepted the [Terms and Conditions](http://js.org/terms.html)
• The site content can be seen at https://promptshield-web.vercel.app/

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The site content is

PromptShield — an open-source JavaScript security toolkit focused on detecting and preventing invisible-character attacks, prompt injection risks, and Unicode obfuscation vulnerabilities in AI-driven and developer tooling workflows.

The site contains:

• 📖 Documentation explaining invisible Unicode attacks and normalization issues
• 🛡 CLI usage guides and configuration examples
• 🧩 API reference for the @promptshield/* packages
• 💡 Security examples relevant to JavaScript, Node.js, and editor integrations
• 🧪 Demonstrations of how invisible characters affect tooling and code review systems

PromptShield is built with the JavaScript ecosystem and integrates with:

• Node.js environments
• JavaScript/TypeScript projects
• CLI tooling
• VSCode / LSP integrations

It is not a personal site.
It is a project documentation and ecosystem resource for JavaScript developers building AI tools, CLI utilities, and editor extensions.

The repository can be found at:
https://github.com/promptshield-io/promptshield