ADD README on FOOD ALLERGY PREDICTION MODEL (EXISTING ON THE ML-REPO)

[alo7lika]

Description

Adding a README for the existing Food Allergy Prediction Model in the machine learning repository.

Fixes : #1446

Type of Change

• Added a new machine learning framework, library, or software.
• Documentation update

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas. (N/A for this update)
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊