Add Pick an Agency to APIs, Data, and ML

[Natden444]

Adds Pick an Agency to the APIs, Data, and ML section (alphabetical order kept).

• Free, read-only REST API over a directory of 47,000+ verified marketing agencies (129,000+ indexed)
• Entirely free: no API key, no signup, no paid tier — CORS enabled
• Docs: https://www.pickanagency.com/developers · OpenAPI 3.1: https://www.pickanagency.com/api/v1/openapi.json
• Also exposes an MCP server for AI agents (listed on the official MCP registry)
• Try: curl "https://www.pickanagency.com/api/v1/search?service=SEO&city=Berlin&limit=3"

Disclosure: I'm the founder.