added bmi calculator

Projects/1-Beginner/BMI_Calculator.md

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+# BMI Calculator
+
+**Tier:**1-Beginner
+
+ BMI (Body Mass Index) Calculator app is designed to help users quickly and accurately calculate their BMI based on their gender, height, weight, and age. Users can input their data, choose their preferred units, and receive their BMI result along with an interpretation of what it means for their health. 
+
+
+
+## User Stories
+
+- [ ]  User can select their gender from a dropdown menu.
+- [ ]  User can enter their height in centimeters using a numeric input field.
+- [ ]  User can enter their weight in kilograms using a numeric input field.
+- [ ]  User can enter their age in years using a numeric input field.
+
+## Bonus features
+
+- [ ] User can drag height input.
+- [ ] Change theme (light/dark) (play with css), play with css 
+
+## Logic
+- BMI is calculated as follows: BMI = weight (kg) / (height (m) * height (m)).
+-Interpretation of the BMI result can include thresholds for different BMI categories (e.g., <18.5 Underweight, 18.5-24.9 Normal Weight, 25-29.9 Overweight, >=30 Obese).
+
+
+## Useful links and resources
+
+- [Guide](https://www.freecodecamp.org/news/html-css-and-javascript-explained-for-beginners/)
+- [Design Ideas](https://dribbble.com/tags/bmicalculator)
+
+## Example projects
+
+- N/A