Added fashion mnist dedicated readme and requirements

[adam-peaston-SC]

Description

Requirements, dedicated readme and hyper-params fine tune.

Model details

What specific models did you add or modify?

Steps to reproduce any training

What settings did you use, batch size, lr, number of nodes, etc

Training results

A gist of logs, a link to tensorboard etc if relevant.

Things done

General:

• [ ] Linting (ruff, black, isort)

If adding a demo model training script:

• [ ] Atomic saving - saving is done atomically to avoid corruption
• [ ] Checkpointing - model can successfully save a checkpoint and resume.
• [ ] Completed a full run