Created BMI Calculator project description

Updated the document to describe the BMI Calculator project, including user stories, calculation details, weight status categories, and bonus features.

Projects/1-Beginner/BMI-Calculator.md

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+# BMI Calculator
+
+**Tier:** 1-Beginner
+
+The Body Mass Index (BMI) Calculator is a simple application designed to calculate and classify a user's BMI based on their height and weight.  
+BMI is a widely used indicator of whether a person has a healthy body weight for their height, providing a quick assessment of general fitness.
+
+This project provides hands-on experience with collecting user input, performing simple calculations, and displaying dynamic results on a web page.
+
+Check out the example BMI calculator app below to better understand the expected functionality and style.
+
+---
+
+## User Stories
+
+- [ ] User can enter their weight (in kg)  
+- [ ] User can enter their height (in cm)  
+- [ ] User can initiate the BMI calculation  
+- [ ] User can view the calculated BMI value rounded to two decimal places 
+- [ ] User can view the corresponding BMI category (e.g., Underweight, Normal, Overweight, Obesity)  
+- [ ] User sees an error message(alert) if any required field is left empty  
+
+---
+
+## Calculation Details
+
+The app should use the standard BMI formula:
+BMI = weight (kg) / [height (m)]²
+
+> Note: Height entered in centimeters must be converted to meters before squaring.
+
+Example:  
+If height = 170 cm (1.7 m) and weight = 65 kg  
+BMI = 65 / (1.7 × 1.7) = 22.5
+
+---
+
+## Weight Status Categories
+
+| BMI Range | Category       |
+|------------|----------------|
+| < 18.5     | Underweight    |
+| 18.5–24.9  | Normal weight  |
+| 25.0–29.9  | Overweight     |
+| ≥ 30.0     | Obesity        |
+
+---
+
+## Bonus Features
+
+- [ ] Display color-coded results based on BMI category  
+- [ ] Include brief health guidance or category information (e.g., from [calculator.net](https://www.calculator.net/bmi-calculator.html))  
+- [ ] Add a reset button to clear inputs and results  
+- [ ] Make the layout responsive for mobile and desktop  
+
+---
+
+## Useful Links and Resources
+
+- [Body Mass Index (Wikipedia)](https://en.wikipedia.org/wiki/Body_mass_index)  
+
+---
+
+## Example Projects
+
+- [BMI-Calculator-Javascript](https://aaronbmicalculator.netlify.app/) ( hosted on Netlify)