Added Docker container setup

Dockerfile

@@ -0,0 +1,38 @@
+# Build stage
+FROM python:3.11-slim as builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy only requirements files first to leverage Docker cache
+COPY requirements.txt .
+COPY lightrag/api/requirements.txt ./lightrag/api/
+
+# Install dependencies
+RUN pip install --user --no-cache-dir -r requirements.txt
+RUN pip install --user --no-cache-dir -r lightrag/api/requirements.txt
+
+# Final stage
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Copy only necessary files from builder
+COPY --from=builder /root/.local /root/.local
+COPY . .
+
+# Make sure scripts in .local are usable
+ENV PATH=/root/.local/bin:$PATH
+
+# Create necessary directories
+RUN mkdir -p /app/data/rag_storage /app/data/inputs
+
+# Expose the default port
+EXPOSE 9621
+
+# Set entrypoint
+ENTRYPOINT ["python", "-m", "lightrag.api.lightrag_server"]