Add NDK skill documentation and examples

- Introduced comprehensive documentation for the Nostr Development Kit (NDK) including an overview, quick reference, and troubleshooting guide.
- Added detailed examples covering initialization, authentication, event publishing, querying, and user profile management.
- Structured the documentation to facilitate quick lookups and deep learning, based on real-world usage patterns from the Plebeian Market application.
- Created an index for examples to enhance usability and navigation.
- Bumped version to 1.0.0 to reflect the addition of this new skill set.

.claude/skills/react/README.md

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+# React 19 Skill
+
+A comprehensive Claude skill for working with React 19, including hooks, components, server components, and modern React architecture.
+
+## Contents
+
+### Main Skill File
+- **SKILL.md** - Main skill document with React 19 fundamentals, hooks, components, and best practices
+
+### References
+- **hooks-quick-reference.md** - Quick reference for all React hooks with examples
+- **server-components.md** - Complete guide to React Server Components and Server Functions
+- **performance.md** - Performance optimization strategies and techniques
+
+### Examples
+- **practical-patterns.tsx** - Real-world React patterns and solutions
+
+## What This Skill Covers
+
+### Core Topics
+- React 19 features and improvements
+- All built-in hooks (useState, useEffect, useTransition, useOptimistic, etc.)
+- Component patterns and composition
+- Server Components and Server Functions
+- React Compiler and automatic optimization
+- Performance optimization techniques
+- Form handling and validation
+- Error boundaries and error handling
+- Context and global state management
+- Code splitting and lazy loading
+
+### Best Practices
+- Component design principles
+- State management strategies
+- Performance optimization
+- Error handling patterns
+- TypeScript integration
+- Testing considerations
+- Accessibility guidelines
+
+## When to Use This Skill
+
+Use this skill when:
+- Building React 19 applications
+- Working with React hooks
+- Implementing server components
+- Optimizing React performance
+- Troubleshooting React-specific issues
+- Understanding concurrent features
+- Working with forms and user input
+- Implementing complex UI patterns
+
+## Quick Start Examples
+
+### Basic Component
+```typescript
+interface ButtonProps {
+  label: string
+  onClick: () => void
+}
+
+const Button = ({ label, onClick }: ButtonProps) => {
+  return <button onClick={onClick}>{label}</button>
+}
+```
+
+### Using Hooks
+```typescript
+const Counter = () => {
+  const [count, setCount] = useState(0)
+  
+  useEffect(() => {
+    console.log(`Count is: ${count}`)
+  }, [count])
+  
+  return (
+    <button onClick={() => setCount(c => c + 1)}>
+      Count: {count}
+    </button>
+  )
+}
+```
+
+### Server Component
+```typescript
+const Page = async () => {
+  const data = await fetchData()
+  return <div>{data}</div>
+}
+```
+
+### Server Function
+```typescript
+'use server'
+
+export async function createUser(formData: FormData) {
+  const name = formData.get('name')
+  return await db.user.create({ data: { name } })
+}
+```
+
+## Related Skills
+
+- **typescript** - TypeScript patterns for React
+- **ndk** - Nostr integration with React
+- **skill-creator** - Creating reusable component libraries
+
+## Resources
+
+- [React Documentation](https://react.dev)
+- [React API Reference](https://react.dev/reference/react)
+- [React Hooks Reference](https://react.dev/reference/react/hooks)
+- [React Server Components](https://react.dev/reference/rsc)
+- [React Compiler](https://react.dev/reference/react-compiler)
+
+## Version
+
+This skill is based on React 19.2 and includes the latest features and APIs.
+