Added localized dockerized build instructions with documentation

DOCKER.md

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+# Docker Usage Instructions
+
+## Building and Running
+
+1. Build the container:
+```bash
+docker-compose build
+```
+
+2. Start a shell session:
+```bash
+docker-compose run --rm repo-to-text
+```
+
+Once in the shell, you can run repo-to-text:
+```bash
+# Process current directory
+repo-to-text
+
+# Process specific directory
+repo-to-text /home/user/myproject
+
+# Use with options
+repo-to-text --output-dir /home/user/output
+```
+
+The container mounts your home directory at `/home/user`, allowing access to all your projects.

Dockerfile

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+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y \
+    tree \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN useradd -m -s /bin/bash user
+
+WORKDIR /app
+COPY . .
+RUN pip install -e . && pip install pyperclip
+
+ENTRYPOINT ["repo-to-text"]

docker-compose.yaml

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+services:
+  repo-to-text:
+    build: .
+    volumes:
+      - ${HOME:-/home/user}:/home/user
+    working_dir: /home/user
+    environment:
+      - HOME=/home/user
+    user: "${UID:-1000}:${GID:-1000}"
+    entrypoint: ["/bin/bash"]