initial project setup: added plugin skill

.claude/skills/claude-plugin-developer/README.md

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+# Claude Plugin Developer Skill
+
+## Installation
+
+1. Download the entire `claude-plugin-developer` folder
+2. Place it in your skills directory (or wherever you manage your skills)
+3. Add it to your marketplace or use it directly
+
+## What's Included
+
+- **SKILL.md** - The main skill file with comprehensive plugin development guidelines
+- **references/** - Detailed guides for specific topics:
+  - `manifest-schema.md` - Complete plugin.json schema reference
+  - `command-metadata.md` - Command frontmatter specifications
+  - `hook-patterns.md` - Event-based automation patterns
+  - `marketplace-guide.md` - Plugin distribution strategies
+  - `mcp-integration.md` - MCP server integration guide
+  - `performance-guide.md` - Performance optimization tips
+- **scripts/** - Helper utilities:
+  - `init_plugin.py` - Generate new plugin structure
+  - `validate_manifest.py` - Validate plugin.json files
+  - `test_commands.py` - Automated command testing
+
+## Quick Usage
+
+When creating a new plugin:
+```bash
+python scripts/init_plugin.py my-new-plugin
+```
+
+To validate a plugin manifest:
+```bash
+python scripts/validate_manifest.py path/to/plugin.json
+```
+
+To test plugin commands:
+```bash
+python scripts/test_commands.py path/to/plugin
+```
+
+## Purpose
+
+This skill helps you create secure, standards-compliant Claude Code plugins following Anthropic's official guidelines. Use it whenever you need to:
+
+- Create a new plugin from scratch
+- Debug plugin loading issues
+- Set up marketplaces
+- Develop commands, agents, hooks, or MCP servers
+- Ensure security compliance
+- Publish to marketplaces