add test cases for BMI_calculator

[sdthinlay]

Type of change

• Added new project
• Bug fix
• [ Missing test case for BMI calculator #647 ] New features
• Enhanced documentation

Changes proposed in this pull request

• Project name :BMI_calculator

• Short description : The project initially lacked valid test cases which is crucial for any beginner's project.

Checklist

• [ - ] The code is Python 3 compatible
• [ - ] I have added relevant comments in my file to make code understandable
• [ - ] I have added my project in a folder which includes all the necessary files

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[sdthinlay]

The pull request is closed because what I intend to do for the project is done in a wrong manner. Apologies to other contributors for the confusion.