Add ComfyUI example

advanced/comfyui/README.md

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+# ComfyUI
+
+[ComfyUI](https://github.com/comfyanonymous/ComfyUI.git) is a powerful and modular stable diffusion GUI and backend that let you design and execute advanced stable diffusion pipelines using a graph/nodes/flowchart based interface.
+
+## Install Lepton sdk
+```shell
+pip install leptonai
+```
+
+## Launch Stable Diffusion web UI in the cloud
+
+Similar to other examples, you can run ComfyUI on Lepton Cloud Platform easily, e.g.:
+
+```shell
+lep photon create -n comfyui -m photon.py
+lep photon push -n comfyui
+lep photon run \
+    -n comfyui \
+    --resource-shape gpu.a10
+    --public
+```
+
+You can visit [dashboard.lepton.ai](https://dashboard.lepton.ai/) to use the web Dashboard, or use `lep` cli to manage the launched deployment:
+```shell
+lep deployment status -n comfyui
+```
+
+## Client
+
+Once the ComfyUI server is up, you can copy the deployment url shown on the Lepton Dashboard (or in the `lep` cli output)
+
+<img src="assets/deployment.png" width=1024>
+
+and visit it in the web browser. e.g. running the sdxl + svd models to do text to video:
+
+<img src="assets/browser.png" width=1024>

advanced/comfyui/photon.py

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+from leptonai.photon import Photon
+
+
+class ComfyUI(Photon):
+    comfyui_version = "329c571"
+    cmd = [
+        "bash",
+        "-c",
+        (
+            "pip install aiohttp einops torchsde &&"
+            "git clone --recursive https://github.com/comfyanonymous/ComfyUI.git && cd"
+            f" ComfyUI && git checkout {comfyui_version} && python main.py --listen"
+            " 0.0.0.0 --port 8080"
+        ),
+    ]
+    deployment_template = {
+        "resource_shape": "gpu.a10",
+    }