added experimental docker image

docker/Dockerfile

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+FROM python:3.10-slim
+RUN apt-get update && apt-get install -y git && rm -rf /var/lib/apt/lists/*
+RUN pip install --upgrade pip && pip install aider-chat
+WORKDIR /app
+CMD ["aider"]
+
+

docker/README.md

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+
+# Running aider with docker (experimental)
+
+You can run aider via docker without doing any local installation, like this:
+
+
+```
+docker run -it --volume `pwd`:/app paulgauthier/aider aider
+```
+
+You will also need to pass in your `OPENAI_API_KEY`, which can be done with the `--openai-api-key` argument:
+
+
+```
+docker run -it --volume `pwd`:/app paulgauthier/aider aider --openai-api-key $OPENAI_API_KEY
+```
+
+You should run the above commands from the root of your git repo.
+
+You should be sure your that
+git repo config contains your user name and email, since the
+docker container won't have your global git config:
+
+```
+git config user.email "you@example.com"
+git config user.name "Your Name"
+```  
+
+Be aware that when you use the in-chat `/run` command, it will
+be running shell commands *inside the docker container*.
+So those commands won't be running in your local environment,
+which may make it tricky to `/run` tests, etc for your project.