Initial commit: Brevet card LaTeX sources

Add LaTeX templates for 200km brevet cards with front and back
sides. Includes Docker-based build system and documentation.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,16 @@
+FROM texlive/texlive:latest
+
+# Install additional packages if needed
+RUN apt-get update && apt-get install -y \
+    make \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /workspace
+
+# Copy project files
+COPY brevetkarte.tex .
+COPY cyclist-logo.png .
+
+# Default command
+CMD ["pdflatex", "-interaction=nonstopmode", "brevetkarte.tex"]