GGUF quants for SPARK.Chroma_preview using sd.cpp.

To use this with sd.cpp, run:

sd --diffusion-model models/SPARK.Chroma_preview-q5_k.gguf --t5xxl models/flux-extra/t5xxl_q8_0.gguf -t 8 --vae models/flux-extra/ae-f16.gguf --sampling-method dpm++2m --scheduler simple --steps 40 --cfg-scale 4 -n "low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, bad anatomy, flat colors, noisy, artifacts, fake, generated" -p 'Rolling green hills. It is a sunny day.' --offload-to-cpu -v -W 1024 -H 1024 --diffusion-fa --chroma-disable-dit-mask --vae-tiling --vae-tile-size 64

Use t5xxl and ae that are compatible with Flux.1 or Chroma.