docs: modify README.md

LICENSE

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+MIT License
+
+Copyright (c) 2025 dori
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-##### 이름하여 유틸 함수 모음집
+# @dori/utils
 
-##### stringUtil
+A comprehensive collection of TypeScript utility functions for modern web development.
 
-###### 문자열 관련 유틸함수
+## Features
 
-##### objectUtil
+- 🛠️ **Comprehensive**: String, object, cookie, number, and validation utilities
+- 📦 **Tree-shakable**: Import only what you need
+- 🔒 **Type-safe**: Full TypeScript support with type definitions
+- ⚡ **Lightweight**: Minimal dependencies and optimized for performance
+- 🧪 **Well-tested**: 100% test coverage with comprehensive test cases
 
-###### 오브젝트 관련 유틸함수
+## Installation
 
-##### cookieUtil
+```bash
+npm install @dori/utils
+# or
+pnpm add @dori/utils
+# or
+yarn add @dori/utils
+```
 
-###### 쿠키 관련 유틸 함수
+## Usage
 
-##### 그 외에는 더 추가될 예정..
+```typescript
+import {
+  stringUtil,
+  objectUtil,
+  cookieUtil,
+  numberUtil,
+  validationUtil,
+} from "@dori/utils";
+
+// String utilities
+const escaped = stringUtil.escapeHtml("<div>Hello</div>");
+const unescaped = stringUtil.unescapeHtml("&lt;div&gt;Hello&lt;/div&gt;");
+
+// Object utilities
+const cleaned = objectUtil.clearNullProperties({ a: 1, b: null, c: 3 });
+const frozen = objectUtil.deepFreeze({ a: { b: 1 } });
+
+// Number utilities
+const total = numberUtil.sum(1, 2, 3, 4, 5); // 15
+const difference = numberUtil.subtract(10, 3); // 7
+
+// Validation utilities
+const isValid = validationUtil.checkEmail("user@example.com"); // true
+const isHttpUrl = validationUtil.checkHttpUrl("https://example.com"); // true
+
+// Cookie utilities
+cookieUtil.setCookie("theme", "dark");
+const theme = cookieUtil.getCookie("theme");
+```
+
+## API Reference
+
+### StringUtil
+
+- `escapeHtml(str: string): string` - Escapes HTML special characters
+- `unescapeHtml(str: string): string` - Unescapes HTML entities
+
+### ObjectUtil
+
+- `clearNullProperties(obj: object): object` - Removes null/undefined properties
+- `deepFreeze(obj: object): object` - Deep freezes an object recursively
+
+### NumberUtil
+
+- `sum(...numbers: number[]): number` - Calculates sum of numbers
+- `subtract(a: number, b: number): number` - Subtracts two numbers
+
+### ValidationUtil
+
+- `checkEmail(email: string): boolean` - Validates email format
+- `checkHttpUrl(url: string): boolean` - Validates HTTP/HTTPS URL format
+
+### CookieUtil
+
+- `setCookie(name: string, value: string, options?: object): void` - Sets a cookie
+- `getCookie(name: string): string | null` - Gets a cookie value
+
+## Contributing
+
+Contributions are welcome! Please read our contributing guidelines and submit pull requests to our repository.
+
+## License
+
+MIT License - see LICENSE file for details.