docs: add README

Author: lsorber

README.md

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+[![Open in Docker Hub](https://img.shields.io/static/v1?label=Docker%20Hub&message=Open&color=blue&logo=dockerhub)](https://hub.docker.com/r/radixai/python-gpu)
+
+# Python GPU
+
+A minimal CUDA and cuDNN install on top of the official `python:3.x-slim` base image.
+
+## 🎁 Features
+
+- ✅ Starts from the official `python:3.x-slim` base image
+- 🐍 Adds a single `micromamba` executable to install CUDA and cuDNN
+- 🧬 Matrix build for Python {3.8, 3.9, 3.10, 3.11} and CUDA {11.8}
+- 📦 Multi-platform build for `linux/amd64` and `linux/arm64`
+- ✨ Image size is only 1.8GB
+
+## ✨ Using
+
+A matrix of tags are available that follow the format `radixai/python-gpu:$PYTHON_VERSION-cuda$CUDA_VERSION`, see the [Docker Hub repository](https://hub.docker.com/r/radixai/python-gpu/tags) for a full list.
+
+### Running the image
+
+```sh
+docker run -it --rm radixai/python-gpu:3.11-cuda11.8 /bin/bash
+```
+
+### Extending the image
+
+```Dockerfile
+FROM radixai/python-gpu:3.11-cuda11.8
+
+...
+```