feat: add dockerfile with the readme

Dockerfile

@@ -0,0 +1,14 @@
+FROM node:22-alpine
+
+WORKDIR /app
+RUN npm install -g @anthropic-ai/claude-code
+
+RUN apk add --no-cache bash
+
+ENV NODE_ENV=production
+ENV CLAUDE_CONFIG_DIR=/root/.claude
+
+# Ensure config directory exists
+RUN mkdir -p $CLAUDE_CONFIG_DIR
+
+ENTRYPOINT ["/bin/bash", "-c", "claude; exec /bin/bash"]

README.md

@@ -1,2 +1,13 @@
 # isolated-claude-code
 
+1. Build the docker image. `docker build -t claude-code `
+2. Run the container `docker run --rm -it -v "$(git rev-parse --show-toplevel 2>/dev/null || pwd)":/app -v "$HOME/.claude":/root/.claude claude-code`
+
+You can also add a shell alias:
+
+```
+alias claude='docker run --rm -it \
+  -v "$(git rev-parse --show-toplevel 2>/dev/null || pwd)":/app \
+  -v "$HOME/.claude":/root/.claude \
+  claude-code'
+```