requirement.txt addition

[21benniel]

Summary

This PR adds a requirements.txt file that captures all Python dependencies required to run the notebooks and utility modules in the Heart-Failure Survival Analysis project. Which was quite helpfull to learn the kaplan and Cox regression

Background & Motivation

While executing Kaplan_Meier_Estimates_Survival_Analysis.ipynb we encountered a ModuleNotFoundError: lifelines. A reproducible dependency list will:

1. Eliminate “works-on-my-machine” issues.
2. Provide a single command—pip install -r requirements.txt—to recreate the environment.
3. Pin critical packages to compatible versions, preventing the resolver conflicts we initially saw (e.g. NumPy 2.x vs. StatsModels).

Key Changes

+ requirements.txt   # new file

Pinned Versions

Package	Version	Reason / Notes
numpy	1.26.4	Upper-bounded (<2) for StatsModels 0.14.x
pandas	2.3.1	Latest stable; used by all notebooks
scipy	1.13.1	Statistical utilities
matplotlib	3.10.3	Plotting
seaborn	0.13.2	Advanced visualisations
statsmodels	0.14.1	OLS & other stats functions
plotly	5.22.0	Interactive charts (used heavily)
scikit-learn	1.4.2	ML algorithms & metrics
lifelines	0.28.0	Survival analysis (Kaplan-Meier, Cox, …)
ipython	8.37.0	Jupyter kernel runtime
jupyter	1.0.0	Notebook interface

Request for Review

• Please verify that the version pins work in your environment.
• Run the test steps above and confirm notebooks execute end-to-end.
• Su