Create README.md

Author: krishnasharma1386

BMI_Calculator/README.md

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+-it is simple if you have python installed on your machine
+   -you need to run Calculator.py in terminal
+   -by typing 'python' for windows and 'python3' for Linux 
+   -it will go like this 'python Calculator.py' or 'python3 Calculator.py'
+   -this will give you GUI and fill in the required information
+   -like age, gender, height, and weight 
+   -Popup will show your BMI
+ 
+ -if you didn't install python on your machine.
+ -here is the installation guide https://realpython.com/installing-python/ please refer to it.