Feature/SK-855 | Monai Example

[sztoor]

Description

This PR aims to add a new example to the FEDn available examples. The example is based on a MONAI classification model code. The plan is to use this example to showcase FEDn to the MONAI community with a familiar code base.

Checklist

• This branch is based on the main branch.
• We don't have a test ready for this example.
• The README file is updated.
• Yes, I have read the contribution document.