add basic docs.

Author: sayakpaul

docs/source/en/using-diffusers/other-formats.md

@@ -240,6 +240,50 @@ Benefits of using a single-file layout include:
 1. Easy compatibility with diffusion interfaces such as [ComfyUI](https://github.com/comfyanonymous/ComfyUI) or [Automatic1111](https://github.com/AUTOMATIC1111/stable-diffusion-webui) which commonly use a single-file layout.
 2. Easier to manage (download and share) a single file.
 
+### DDUF
+
+<Tip warning={true}>
+
+DDUF is an experimental file format and APIs related to it can change in the future.
+
+</Tip>
+
+DDUF, aka (**D**DUF’s **D**iffusion **U**nified **F**ormat) is a file format designed to make storing, distributing, and using diffusion models much easier. Built on the ZIP file format, DDUF offers a standardized, efficient, and flexible way to package all parts of a diffusion model into a single, easy-to-manage file. It tries to provide a sweet spot between our multi-folder format and widely popular single-file format. To learn more about it, please check out the documentation [here](https://huggingface.co/docs/hub/dduf).
+
+Below we show, how to load a DDUF checkpoint in a [`DiffusionPipeline`]:
+
+```py
+from diffusers import DiffusionPipeline
+import torch
+
+pipe = DiffusionPipeline.from_pretrained(
+    "DDUF/FLUX.1-dev-DDUF", dduf_file="FLUX.1-dev.dduf", torch_dtype=torch.bfloat16
+).to("cuda")
+image = pipe(
+    "photo a cat holding a sign that says Diffusers", num_inference_steps=50, guidance_scale=3.5
+).images[0]
+image.save("cat.png")
+```
+
+To obtain `.dduf` checkpoint, we rely on `huggingface_hub`'s `export_folder_as_dduf()` utility, which takes care of all the necessary file-level validations:
+
+```py
+from huggingface_hub import export_folder_as_dduf
+from diffusers import DiffusionPipeline
+import torch 
+
+pipe = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-dev", torch_dtype=torch.bfloat16)
+
+save_folder = "flux-dev"
+pipe.save_pretrained("flux-dev")
+export_folder_as_dduf("flux-dev.dduf", folder_path=save_folder)
+
+<Tip>
+
+We support packaging and loading quantized checkpoints in the DDUF format as long as they respect the multi-folder structure.
+
+</Tip>
+
 ## Convert layout and files
 
 Diffusers provides many scripts and methods to convert storage layouts and file formats to enable broader support across the diffusion ecosystem.