[docs]add coreml.mdx

[yiyixuxu]

porting this post to doc https://huggingface.co/blog/diffusers-coreml

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[pcuenca]

This is something I've been wanting to do, thanks a lot @yiyixuxu for starting the process!

That post was focused on Apple's conversion library, but a few things have happened since then that we could mention:

• The DPM-Solver++ scheduler was ported to Swift, so it can be used on Apple hardware too (Inference is twice as fast as it takes half the number of steps).
• Other features now supported by Apple's library: negative prompts, image-to-image.
• The community converted several Dreambooth models to Core ML.
• We now have https://github.com/huggingface/swift-coreml-diffusers as a technology demo that people can use easily and programmers can extend.

I wouldn't make a long and comprehensive post about all this, but maybe we can rework this one to focus more on diffusers or diffusers-like features rather than just on the conversion library.

I can prepare a first draft and send it to you, would that be ok? I'll also update the blog post itself when the documentation is out.

[yiyixuxu]

@pcuenca sounds great! thanks!

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[patrickvonplaten]

Gentle ping here

[yiyixuxu]

closing since we now have this #2987