Add Claude Plugin Marketplace manifest, icon, and README

[Copilot]

Adds the .claude-plugin/ directory with all files needed for Claude Plugin Marketplace compatibility, enabling installation via /plugin install scottchronicity/ephemeris-mcp.

• Declares mcp-server type with uvx ephemeris-mcp runtime for zero-install execution
• Points to PyPI as the package source
• Includes MCP capabilities and category metadata
• Adds icon field pointing to ./icon.svg
• Adds an astronomy-themed SVG icon
• Adds a Marketplace README with Quick Start, Features, and Tools sections
• Adds Claude Desktop claude_desktop_config.json snippet to the top area of the root README.md

{
  "type": "mcp-server",
  "icon": "./icon.svg",
  "runtime": {
    "command": "uvx",
    "args": ["ephemeris-mcp"]
  },
  "source": {
    "type": "pypi",
    "package": "ephemeris-mcp"
  }
}

Original prompt

I want to make this repository compatible with the Claude Plugin Marketplace so users can install it via /plugin install.
​Create a directory named .claude-plugin/ in the root.
​Inside it, create a plugin.json file.
​The manifest should define this as an mcp-server type.
​Use uvx as the command and ephemeris-mcp as the argument (since it's on PyPI).
​Add metadata: name 'ephemeris-mcp', a description about 'Precision astronomical ephemeris using Swiss Ephemeris', and set the version to match the current PyPI version.
​Include a capabilities section that maps to the MCP server."
​What the Resulting .claude-plugin/plugin.json Should Look Like
​If you want to do it manually or verify Copilot's work, here is the exact structure for your specific project

{
"name": "ephemeris-mcp",
"version": "0.1.0",
"description": "Precision astronomical ephemeris for AI agents. Provides planetary positions and chart angles via the Swiss Ephemeris.",
"author": "scottchronicity",
"type": "mcp-server",
"source": {
"type": "pypi",
"package": "ephemeris-mcp"
},
"runtime": {
"command": "uvx",
"args": ["ephemeris-mcp"]
},
"capabilities": {
"mcp": {
"name": "ephemeris-mcp",
"description": "Calculates tropical zodiac positions, houses, and celestial body data."
}
},
"categories": ["science", "data-analysis", "astronomy"]
}

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[scottchronicity]

@copilot

Add the following to top area of root readme.md in the repo

To use this in Claude Desktop, add this to your claude_desktop_config.json:

   "mcpServers": {
     "ephemeris": {
       "command": "uvx",
       "args": ["ephemeris-mcp"]
     }
   }

[Copilot]

@copilot

Add the following to top area of root readme.md in the repo ...

Added the Claude Desktop config snippet to the top area of the root README.md in 3688777.