docs: add README

README.md

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+# DuckDuckGo MCP Server
+
+Model Context Protocol (MCP) server that exposes **DuckDuckGo** search as a tool for LLM clients (Claude Desktop, Cursor, VS Code, ...), backed by a self-hosted [SearXNG](https://github.com/searxng/searxng) metasearch instance.
+
+SearXNG aggregates results from DuckDuckGo, Google, Brave, Wikipedia, and more with its own request handling — no browser fingerprinting, no API keys, fully self-hosted.
+
+Part of the MCP Search Servers project:
+
+| Repo | What it is |
+|------|------------|
+| [google-mcp](https://git.jarianc.com/jarianc/google-mcp) | Same design for Google search |
+
+## Service
+
+| Service          | Port | MCP tool           | Description                        |
+|------------------|------|--------------------|------------------------------------|
+| `duckduckgo-mcp` | 3002 | `duckduckgo_search`| DuckDuckGo results via SearXNG     |
+| `searxng`        | —    | —                  | Internal metasearch engine (not published) |
+
+The server exposes:
+
+- `/sse` + `/messages/` — MCP SSE transport
+- `/search?q=...&num=N` — plain HTTP JSON endpoint
+- `/health` — liveness probe
+
+## Quick Start
+
+```bash
+cp .env.example .env        # fill in SEARXNG_SECRET
+docker compose up -d --build
+```
+
+Generate a SearXNG secret:
+
+```bash
+python3 -c "import secrets; print(secrets.token_hex(32))"
+```
+
+Verify:
+
+```bash
+curl http://localhost:3002/health
+curl "http://localhost:3002/search?q=python&num=3"
+```
+
+Then point your LLM client at `http://localhost:3002/sse`.
+
+## Tool Contract
+
+```json
+{
+  "name": "duckduckgo_search",
+  "arguments": { "query": "Python programming language", "num_results": 5 }
+}
+```
+
+Returns numbered results with title, URL, and snippet (max 20 results, queries capped at 500 characters).
+
+## Project Structure
+
+```
+.
+├── duckduckgo-mcp/    # MCP server (SSE transport + tools)
+│   ├── server.py
+│   └── Dockerfile
+├── lib/               # Shared search engine implementations
+│   ├── duckduckgo_search.py
+│   ├── google_search.py  # also used by the google-mcp sibling repo
+│   ├── playwright_manager.py
+│   └── rate_limiter.py
+├── searxng-settings.yml
+├── test_client.py
+└── docker-compose.yml
+```