Add README.md with installation instructions, usage examples, and supported holidays

Author: igogo5yo

README.md

@@ -0,0 +1,50 @@
+# is-us-holiday-light
+
+[![NPM](https://img.shields.io/npm/v/eslint-plugin-import-monorepo.svg "NPM package version")](https://www.npmjs.com/package/is-us-holiday-light)
+[![NPM](https://img.shields.io/npm/dt/eslint-plugin-import-monorepo.svg "NPM package downloads")](https://www.npmjs.com/package/is-us-holiday-light)
+
+`is-us-holiday-light` is a lightweight JavaScript library to check if a given date is a US holiday.
+
+## Installation
+
+You can install the library using npm:
+
+```bash
+npm install is-us-holiday-light
+```
+
+Or using yarn:
+
+```bash
+yarn add is-us-holiday-light
+```
+
+## Usage
+
+```javascript
+const isUsHoliday = require('is-us-holiday-light');
+
+const date = new Date('2023-07-04');
+console.log(isUsHoliday(date)); // true, because it's Independence Day
+```
+
+## Supported Holidays
+
+- New Year's Day
+- Martin Luther King Jr. Day
+- Presidents' Day
+- Memorial Day
+- Independence Day
+- Labor Day
+- Columbus Day
+- Veterans Day
+- Thanksgiving Day
+- Christmas Day
+
+## Contributing
+
+Contributions are welcome! Please open an issue or submit a pull request.
+
+## License
+
+This project is licensed under the MIT License.