Added details to README.md

Author: siddhi-244

bmi-calculator/README.md

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+### BMI Calculator
+BMI calculator can be used to calculate body mass index of people.
+
+### Use of the Project:
+ It can be used in gyms etc to check if a person is overweight or underweight.
+
+### Used Technologies
+  * HTML5
+  * CSS3
+  * JavaScript
+
+
+#### Steps to Use:
+
+---
+
+- Download or clone the repository
+
+```
+git clone https://github.com/Ayushparikh-code/Web-dev-mini-projects.git
+```
+
+- Go to the directory
+- Run the index.html file
+- Start Calculating!!
+--- 
+
+## Screenshots 
+![Screenshot (35)](https://user-images.githubusercontent.com/69195262/125057793-3d825f00-e0c7-11eb-8a87-a80ecf6603e1.png)