Add a command line interface to our bmi calculator
Level: Beginner (score: 2)
Complete create_parser below so that our BMI program can be called like this:
$ python bmi.py -h
usage: bmi.py [-h] [-w WEIGHT] [-l LENGTH]
Calculate your BMI.
optional arguments:
-h, --help show this help message and exit
-w WEIGHT, --weight WEIGHT
Your weight in kg
-l LENGTH, --length LENGTH
Your length in cm
$ python bmi.py -w 80 -l 187
Your BMI is: 22.88
Please note that calc_bmi and handle_args are given, you only need to code create_parser!