Add MCP client configuration examples to CONTRIBUTING.md

[ochafik]

Summary

This PR adds comprehensive documentation for using the example servers with MCP clients that support stdio transport, such as Claude Desktop and VS Code. It includes two complete configuration examples: one for using published npm packages and one for local development.

Key Changes

• Added "With MCP Clients" section explaining how to configure MCP clients to use the example servers via stdio transport
• Provided a complete MCP server configuration JSON snippet for all 20 example servers using published npm packages from the registry
• Added "Local Development" subsection with detailed setup instructions for cloning and installing the repository
• Included a second configuration JSON snippet showing how to configure all servers for local development with automatic rebuilding on launch
• Added a note about the qr server requiring repository cloning with a link to its README
• Documented the use of bash -c for local development to enable building and running servers from custom paths

Notable Details

• Both configuration examples are wrapped in collapsible <details> sections for better readability
• The local development configuration uses bash -c to execute build and run commands, with a placeholder path (~/code/ext-apps) that users should customize
• All npm-based servers use consistent npx invocation with --silent and explicit registry flags
• Python-based servers (qr and say) use uv for execution with appropriate index configurations

https://claude.ai/code/session_014pjt7bE4ckHns5QFPkdWQp

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@modelcontextprotocol/ext-apps

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@modelcontextprotocol/server-basic-preact

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@modelcontextprotocol/server-basic-react

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@modelcontextprotocol/server-basic-solid

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@modelcontextprotocol/server-basic-svelte

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@modelcontextprotocol/server-basic-vanillajs

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@modelcontextprotocol/server-basic-vue

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@modelcontextprotocol/server-budget-allocator

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@modelcontextprotocol/server-cohort-heatmap

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@modelcontextprotocol/server-customer-segmentation

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@modelcontextprotocol/server-debug

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@modelcontextprotocol/server-map

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@modelcontextprotocol/server-pdf

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@modelcontextprotocol/server-scenario-modeler

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@modelcontextprotocol/server-shadertoy

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@modelcontextprotocol/server-sheet-music

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@modelcontextprotocol/server-system-monitor

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@modelcontextprotocol/server-threejs

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@modelcontextprotocol/server-transcript

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@modelcontextprotocol/server-video-resource

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@modelcontextprotocol/server-wiki-explorer

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commit: 108f07f