docs: Expand README with a detailed project overview, skill categories, usage instructions, documentation links, and contribution guidelines.

feat: add README.md detailing Claude Code plugins, their descriptions, and installation instructions.

feat(skill): Add mcp-builder skill

feat(skill): Add humane design skill with principles, concepts, and references, along with a skills directory README and .gitignore.

feat(skill): Introduce animation skill with basic and advanced examples, API reference, and documentation.

feat(skill): Add humane-design skill, including design principles, a checklist, and an updated skills README.

feat(skill): add LICENSE and SKILL.md files for skill creation guidance and licensing terms

feat(skill): add security reminder hook to warn about potential vulnerabilities in file edits

feat(skill): implement Ralph Wiggum plugin for iterative self-referential AI loops

feat(skill): add comprehensive PR review agents for code quality analysis

feat(skill): Skill Development and Skill Creator references for effective skill creation

feat(skill): add learning output style plugin with interactive learning and educational insights

feat(skills): hookify

feat(skill): add frontend design plugin with comprehensive guidelines and usage examples

feat(skill): add feature development plugin with structured workflow and agent support