feat: Add beginner-friendly withDefaultConfig() and Easy Entry Point

- Add withDefaultConfig() for one-line setup
- Add Easy Entry Point (hua-i18n-sdk/easy) for beginners
- Add autoLanguageSync feature for automatic language change detection
- Enhance documentation with beginner-friendly guides
- Fix GitHub links and improve documentation structure
- Add comprehensive tests for withDefaultConfig()
- Update package version to 1.2.0

Breaking Changes: None
Migration: Existing code works without changes

Author: echonet-ais

CONTRIBUTING.md

@@ -17,7 +17,7 @@ Thank you for your interest in contributing to hua-i18n-sdk! This document provi
 2. Clone your fork:
 
    ```bash
-   git clone https://github.com/YOUR_USERNAME/i18n-sdk.git
+   git clone https://github.com/HUA-Labs/i18n-sdk.git
    cd i18n-sdk
    ```
 

README.en.md

@@ -1,20 +1,24 @@
 # hua-i18n-sdk
 
-> **v1.1.0** - Simple and powerful internationalization SDK for React applications
+> **v1.2.0** - Simple and powerful internationalization SDK for React applications
 
 [![npm version](https://badge.fury.io/js/hua-i18n-sdk.svg)](https://badge.fury.io/js/hua-i18n-sdk)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![TypeScript](https://img.shields.io/badge/TypeScript-007ACC?logo=typescript&logoColor=white)](https://www.typescriptlang.org/)
+[![GitHub stars](https://img.shields.io/github/stars/HUA-Labs/i18n-sdk?style=social)](https://github.com/HUA-Labs/i18n-sdk)
+
+**⭐ If this project helped you, please give it a star!**
 
 ## Key Features
 
 - **Simple API**: Intuitive and easy-to-use interface
-- **Type Safety**: Full TypeScript support with type safety
+- **Beginner-friendly**: One-line setup with `withDefaultConfig()`
+- **Type Safety**: Full TypeScript support
 - **SSR Support**: Perfect compatibility with Next.js server components
-- **Robust Error Handling**: Automatic retry, recovery strategies, user-friendly messages
+- **Robust Error Handling**: Auto-retry, recovery strategies, user-friendly messages
 - **Lightweight Bundle**: Optimized size with tree-shaking support
 - **Real-time Language Switching**: Dynamic language switching support
-- **Developer Friendly**: Debug mode, missing key display, detailed logging
+- **Developer-friendly**: Debug mode, missing key display, detailed logging
 
 ## Installation
 
@@ -28,17 +32,87 @@ pnpm add hua-i18n-sdk
 
 ## Quick Start
 
-### 1. Basic Configuration
+### 🚀 For Beginners (Recommended) - Easy Entry Point
+
+```tsx
+// Beginner-friendly entry point - start immediately without complex configuration!
+import { withDefaultConfig, useTranslation } from 'hua-i18n-sdk/easy';
+
+// One line setup! Start with default configuration
+export const I18nProvider = withDefaultConfig();
+
+function App() {
+  return (
+    <I18nProvider>
+      <MyComponent />
+    </I18nProvider>
+  );
+}
+
+function MyComponent() {
+  const { t, tWithParams } = useTranslation();
+  
+  return (
+    <div>
+      <h1>{t('common.welcome')}</h1>
+      <p>{tWithParams('common.greeting', { name: 'John' })}</p>
+    </div>
+  );
+}
+```
+
+### 🚀 For Beginners (Recommended) - Default Entry Point
+
+```tsx
+import { withDefaultConfig, useTranslation } from 'hua-i18n-sdk';
+
+// One line setup! Start with default configuration
+export const I18nProvider = withDefaultConfig();
+
+function App() {
+  return (
+    <I18nProvider>
+      <MyComponent />
+    </I18nProvider>
+  );
+}
+
+function MyComponent() {
+  const { t, tWithParams } = useTranslation();
+  
+  return (
+    <div>
+      <h1>{t('common.welcome')}</h1>
+      <p>{tWithParams('common.greeting', { name: 'John' })}</p>
+    </div>
+  );
+}
+```
+
+### ⚙️ For Intermediate Users (Partial Customization)
+
+```tsx
+import { withDefaultConfig } from 'hua-i18n-sdk';
+
+// Customize only what you need
+export const I18nProvider = withDefaultConfig({
+  defaultLanguage: 'en',
+  namespaces: ['common', 'auth'],
+  debug: true,
+});
+```
+
+### 🔧 For Advanced Users (Full Customization)
 
 ```tsx
 import { I18nProvider, useTranslation, createI18nConfig } from 'hua-i18n-sdk';
 
 const i18nConfig = createI18nConfig({
-  defaultLanguage: 'en',
-  fallbackLanguage: 'ko',
+  defaultLanguage: 'ko',
+  fallbackLanguage: 'en',
   supportedLanguages: [
-    { code: 'en', name: 'English', nativeName: 'English' },
     { code: 'ko', name: 'Korean', nativeName: '한국어' },
+    { code: 'en', name: 'English', nativeName: 'English' },
   ],
   namespaces: ['common', 'auth'],
   loadTranslations: async (language, namespace) => {
@@ -56,11 +130,7 @@ const i18nConfig = createI18nConfig({
     userFriendlyMessages: true
   }
 });
-```
 
-### 2. Provider Setup
-
-```tsx
 function App() {
   return (
     <I18nProvider config={i18nConfig}>
@@ -70,59 +140,96 @@ function App() {
 }
 ```
 
-### 3. Translation Usage
-
-```tsx
-function MyComponent() {
-  const { t, tWithParams } = useTranslation();
-  
-  return (
-    <div>
-      <h1>{t('common.welcome')}</h1>
-      <p>{tWithParams('common.greeting', { name: 'John' })}</p>
-    </div>
-  );
-}
-```
-
 ## Translation File Structure
 
 ```text
 translations/
-├── en/
+├── ko/
 │   ├── common.json
 │   └── auth.json
-└── ko/
+└── en/
     ├── common.json
     └── auth.json
 ```
 
 ### Translation File Examples
 
 ```json
-// translations/en/common.json
+// translations/ko/common.json
 {
-  "welcome": "Welcome",
-  "greeting": "Hello, {{name}}!",
+  "welcome": "환영합니다",
+  "greeting": "안녕하세요, {{name}}님!",
   "buttons": {
-    "save": "Save",
-    "cancel": "Cancel"
+    "save": "저장",
+    "cancel": "취소"
   }
 }
 ```
 
 ```json
-// translations/ko/common.json
+// translations/en/common.json
 {
-  "welcome": "환영합니다",
-  "greeting": "안녕하세요, {{name}}님!",
+  "welcome": "Welcome",
+  "greeting": "Hello, {{name}}!",
   "buttons": {
-    "save": "저장",
-    "cancel": "취소"
+    "save": "Save",
+    "cancel": "Cancel"
   }
 }
 ```
 
+## withDefaultConfig() Options
+
+```tsx
+export const I18nProvider = withDefaultConfig({
+  // Default language (default: 'ko')
+  defaultLanguage: 'en',
+  
+  // Fallback language (default: 'en')
+  fallbackLanguage: 'ko',
+  
+  // Namespaces (default: ['common'])
+  namespaces: ['common', 'auth', 'dashboard'],
+  
+  // Debug mode (default: NODE_ENV === 'development')
+  debug: true,
+  
+  // Auto language sync events (default: true)
+  // Automatically registers event listeners: huaI18nLanguageChange, i18nLanguageChanged
+  // Automatically detects browser language changes or external language switching events
+  autoLanguageSync: true,
+});
+```
+
+### autoLanguageSync Option Details
+
+The `autoLanguageSync` option automatically detects and handles language switching events:
+
+```tsx
+// Events that are automatically detected
+window.addEventListener('huaI18nLanguageChange', (event) => {
+  // SDK internal language change event
+  const newLanguage = event.detail;
+});
+
+window.addEventListener('i18nLanguageChanged', (event) => {
+  // General language change event
+  const newLanguage = event.detail;
+});
+```
+
+**Usage Example:**
+
+```tsx
+// When changing language from other components
+const changeLanguage = (language) => {
+  // Event dispatch → withDefaultConfig() automatically detects
+  window.dispatchEvent(new CustomEvent('i18nLanguageChanged', { 
+    detail: language 
+  }));
+};
+```
+
 ## Advanced Features
 
 ### Language Switching
@@ -155,9 +262,9 @@ import { ssrTranslate } from 'hua-i18n-sdk';
 
 export default function ServerComponent() {
   const title = ssrTranslate({
-    translations: translations.en.common(),
+    translations: translations.ko.common(),
     key: 'common.welcome',
-    language: 'en',
+    language: 'ko',
   });
 
   return <h1>{title}</h1>;
@@ -187,11 +294,11 @@ t('common.invalid'); // ❌ Type error
 
 ## Error Handling (v1.1.0)
 
-### Automatic Retry and Recovery
+### Auto-retry and Recovery
 
 ```tsx
 const config = {
-  // ... basic configuration
+  // ... basic config
   errorHandling: {
     recoveryStrategy: {
       maxRetries: 3,
@@ -277,6 +384,7 @@ const config: I18nConfig = {
 - [SDK Reference](./docs/SDK_REFERENCE.md) - Complete API documentation
 - [Changelog](./docs/CHANGELOG.md) - Version changes
 - [Environment Guides](./docs/ENVIRONMENT_GUIDES.md) - Various environment setups
+- [Environment Examples](./docs/ENVIRONMENT_EXAMPLES.md) - Environment-specific setup examples
 - [Contributing Guide](./CONTRIBUTING.md) - How to contribute to the project
 
 ## Testing
@@ -291,7 +399,6 @@ npm run test:coverage
 
 ```bash
 npm run build
-npm run build:types
 ```
 
 ## Contributing