Task: Create class to impement Mifflin St. Jeor equation for BMR calculations

[juan-chocolon]

Title

Task: Create class to impement Mifflin St. Jeor equation for BMR calculations

Steps

• Create a new class in app/src/bmr/helpers/equations.py
• Create new test scripts to test new Mifflin class as a new script: tests/test_mifflin_eqs.py

Parent

Story: Perform Calculations on Input Data