Organize documentation into docs/ directory

- Move SECURITY.md, QUICK_START.md, MCPMC_STDIO_INTEGRATION.md to docs/
- Update README.md with documentation links

README.md

@@ -32,3 +32,9 @@ Your MCP client will be notified when the MCP server is ready. No configuration
 
 Maybe you need to change some settings of an MCP server: `MCPMC: change the "max_records" of the filesystem server to be 2000`
 
+## Documentation
+
+- [Quick Start Guide](docs/QUICK_START.md) - Get started with MCPMC
+- [Security Guide](docs/SECURITY.md) - Security configuration and best practices  
+- [MCP Integration](docs/MCPMC_STDIO_INTEGRATION.md) - Claude Code integration details
+