Add README and examples

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README.md

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+# ComfyUI-Background-Edit
+
+ComfyUI-Background-Edit is a set of [ComfyUI](https://www.comfy.org/) nodes for editing background of images/videos with CUDA acceleration support.
+
+Supported use cases:
+
+- Background blurring
+- Background removal
+- Background swapping
+
+The CUDA accelerated nodes can be used in real-time workflows for live video streams using [comfystream](https://github.com/yondonfu/comfystream).
+
+--- 
+
+- [ComfyUI-Background-Edit](#comfyui-background-edit)
+- [Install](#install)
+  - [Comfy Registry](#comfy-registry)
+  - [Manual](#manual)
+- [Example Real-Time Live Video Workflows](#example-real-time-live-video-workflows)
+- [Example Image Workflows](#example-image-workflows)
+- [Nodes](#nodes)
+
+# Install
+
+The recommended installation method is to use the Comfy Registry.
+
+## Comfy Registry
+
+These nodes can be installed via the [Comfy Registry](https://registry.comfy.org/nodes/comfyui-background-edit).
+
+```
+comfy node registry-install comfyui-background-edit
+```
+
+## Manual
+
+These nodes can also be installed manually by copying them into your `custom_nodes` folder and then installing dependencies:
+
+```
+cd custom_nodes
+git clone https://github.com/yondonfu/ComfyUI-Background-Edit
+cd ComfyUI-Background-Edit
+pip install -r requirements.txt
+```
+
+# Example Real-Time Live Video Workflows
+
+**Prerequisites**
+
+- Install [ComfyUI-Depth-Anything-Tensorrt](https://github.com/yuvraj108c/ComfyUI-Depth-Anything-Tensorrt).
+  - The example workflow uses TensorRT to accelerate DepthAnything2 to meet real-time requirements.
+
+The [workflow (API format)](https://github.com/yondonfu/comfystream/blob/main/workflows/depth-bg-blur-gpu-workflow.json) can be used with [comfystream](https://github.com/yondonfu/comfystream) to run real-time background blurring on a live video stream.
+
+The [workflow](./examples/realtime-depth-bg-blur-workflow.json) can also be saved and dropped into ComfyUI to load the workflow for further modifications.
+
+# Example Image Workflows 
+
+**Prerequisites**:
+
+- Install [ComfyUI-DepthAnythingV2](https://github.com/kijai/ComfyUI-DepthAnythingV2).
+
+The following example workflows are applied to this input image:
+
+![input](./examples/input.jpg)
+
+The output images can be saved and dropped into ComfyUI to load the workflows that created them.
+
+**Background Blurring**
+
+![depth-bg-blur-output](./examples/depth-bg-blur-output.png)
+
+**Background Removal**
+
+![depth-bg-black-output](./examples/depth-bg-black-output.png)
+
+**Background Swapping**
+
+![depth-bg-blue-output](./examples/depth-bg-blue-output.png)
+
+This output just shows the background being swapped to a solid blue color, but in theory the background could be any image of your choice!
+
+# Nodes
+
+| Node            | Description                                                                                                 |
+| --------------- | ----------------------------------------------------------------------------------------------------------- |
+| BackgroundColor | Creates black/red/green/blue images with same dimensions as input images.                                   |
+| Composite       | Creates composites of input foreground images, background images and foreground masks (CPU/CUDA supported). |
+| GaussianBlur    | Applies gaussian blur to input images (CPU/CUDA supported).                                                 |