add instructions on using contrast-agnostic weights with nnunet

[naga-karthik]

This PR adds a quick start guide on using contrast agnostic model's pretrained weights with nnUNet. Detailed instructions are provided within the guide.

[jcohenadad]

Is this the right location for this guide? Ppl working on the contrast-agnostic repos won't see this guide, hence it will be useless. Why not putting it in the contrast-agnostic repos instead?

[naga-karthik]

Why not putting it in the contrast-agnostic repos instead?

I think I will eventually put it there. You're right! The contrast-agnostic repo is undergoing cleaning right now and I didn't think of putting it there. Once it has been tested, I will move the instructions to the contrast-agnostic repo

[jcohenadad]

I think I will eventually put it there.

why not doing it now? otherwise we might forget (i'm speaking from experience 😉 )

[naga-karthik]

Closing this PR as the contents have been moved to sct-pipeline/contrast-agnostic-softseg-spinalcord#129

Please follow the updates there!