Update README to include organisation creation

[StrongLachlanM]

Description

Changes the wording to show that you no longer have to change your existing org name and can create a new org instead.

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