Add readme

README.md

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+# [Rembg](https://github.com/danielgatis/rembg) Background Removal Node for [ComfyUI](https://github.com/comfyanonymous/ComfyUI)
+1. Clone to your `custom_nodes` folder in ComfyUI:
+
+```
+git clone https://github.com/Jcd1230/rembg-comfyui-node.git
+```
+
+2. Install `rembg[gpu]` (recommended) or `rembg`, depending on GPU support, to your ComfyUI virtual environment. E.g.:
+
+```
+pip install rembg[gpu]
+```
+
+
+To use, just look for the *Image Remove Background (rembg)* node.
+
+![Demonstration of the rembg node](https://i.imgur.com/12NEuyx.png)
+
+
+## Acknowledgements
+Thanks to [WASasquatch's Node Suite](https://github.com/WASasquatch/was-node-suite-comfyui) for great examples and a couple helper functions.