Add README for BMI Calculator project

This README provides an overview of the BMI Calculator project, including its features, usage instructions, and contribution guidelines.

Author: nitinyadav2188

README.md

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+# BMI Calculator
+
+[![Status](https://img.shields.io/badge/status-active-brightgreen.svg)](https://github.com/niraj0624/bmi-calculator)
+[![License](https://img.shields.io/github/license/niraj0624/bmi-calculator.svg)](LICENSE)
+[![GitHub issues](https://img.shields.io/github/issues/niraj0624/bmi-calculator.svg)](https://github.com/niraj0624/bmi-calculator/issues)
+[![GitHub forks](https://img.shields.io/github/forks/niraj0624/bmi-calculator.svg)](https://github.com/niraj0624/bmi-calculator/network)
+[![GitHub stars](https://img.shields.io/github/stars/niraj0624/bmi-calculator.svg)](https://github.com/niraj0624/bmi-calculator/stargazers)
+
+## Description
+
+**BMI Calculator** is a simple, lightweight web application built using vanilla JavaScript, HTML, and CSS. It allows users to quickly calculate their Body Mass Index (BMI) based on their height and weight. BMI is a reliable indicator of body fatness and is widely used to screen for weight categories that may lead to health problems.
+
+---
+
+## Features
+
+- User-friendly interface
+- Real-time BMI calculation
+- Input validation for height and weight
+- Categorizes BMI results (e.g., Underweight, Normal, Overweight, Obese)
+- Responsive design for desktops and mobile devices
+- No external dependencies
+
+---
+
+## Demo
+
+You can view a live demo [here](https://niraj0624.github.io/bmi-calculator/) 
+
+---
+
+## Getting Started
+
+### Prerequisites
+
+- A modern web browser (Chrome, Firefox, Edge, etc.)
+
+### Installation
+
+1. **Clone the repository:**
+    ```bash
+    git clone https://github.com/niraj0624/bmi-calculator.git
+    ```
+2. **Navigate to the project directory:**
+    ```bash
+    cd bmi-calculator
+    ```
+3. **Open `index.html` in your browser:**
+    - Double click `index.html`
+    - or run:
+      ```bash
+      open index.html # Mac
+      start index.html # Windows
+      ```
+
+---
+
+## Usage
+
+1. Enter your height (in cm or meters, as specified).
+2. Enter your weight (in kg).
+3. Click on the "Calculate" button.
+4. View your BMI and the associated category.
+
+---
+
+## Repository Status
+
+- **Project Status:** Active & maintained
+- **Latest Release:** See [Releases](https://github.com/niraj0624/bmi-calculator/releases)
+- **Issues:** Please use the [issue tracker](https://github.com/niraj0624/bmi-calculator/issues) to report bugs or suggest features.
+
+---
+
+## Technologies Used
+
+- **JavaScript** (39.3%)
+- **HTML** (32.4%)
+- **CSS** (28.3%)
+
+---
+
+## Contributing
+
+We welcome contributions! Please follow these steps to contribute:
+
+1. **Fork** this repository.
+2. **Clone** your forked repo:
+    ```bash
+    git clone https://github.com/niraj0624/bmi-calculator.git
+    ```
+3. **Create a new branch** for your feature or bugfix:
+    ```bash
+    git checkout -b feature/your-feature-name
+    ```
+4. **Make your changes** and **commit** them:
+    ```bash
+    git add .
+    git commit -m "Describe your changes"
+    ```
+5. **Push** to your forked repository:
+    ```bash
+    git push origin feature/your-feature-name
+    ```
+6. **Open a Pull Request** against the `main` branch of this repository.
+
+For major changes, please open an issue first to discuss what you would like to change.
+
+**Contribution Guidelines:**
+- Write clear, concise commit messages
+- Follow the existing code style
+- Check for lint errors before submitting
+- Add comments and documentation where necessary
+
+---
+
+## License
+
+This project is licensed under the [MIT License](LICENSE).
+
+---
+
+## Contact
+
+For any questions or feedback, please open an issue or contact the maintainer [@niraj0624](https://github.com/niraj0624).
+
+---
+
+For any questions or feedback, please open an issue or contact the maintainer [@niraj0624](https://github.com/niraj0624).
+
+---