Add ComfyUI model installation guide (#6)

- Add ComfyUI model installation guide (e19e19169ad1108fa53005b2f713b37d3e273926)
- Normalize README folder tree formatting (c1589d8e1328efcfe3b3be0d817da4614e8efc52)

README.md

@@ -15,10 +15,10 @@ Place the files in the following folders:
 ```
 📂 ComfyUI/
 ├── 📂 models/
-│   ├── 📂 diffusion_models/
-│   │   ├── trellis2_bf16.safetensors
 │   ├── 📂 clip_vision/
 │   │   └── dino_v3_vit_l.safetensors
+│   ├── 📂 diffusion_models/
+│   │   └── trellis_2_bf16.safetensors
 │   ├── 📂 vae/
 │   │   ├── trellis_2_shape_vae_bf16.safetensors
 │   │   └── trellis_2_texture_vae_bf16.safetensors