Add Docker support with documentation

Dockerfile

@@ -0,0 +1,15 @@
+FROM php:8.2-cli
+
+# Install dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    unzip \
+    libzip-dev \
+    && docker-php-ext-install zip
+
+WORKDIR /scanner
+COPY . .
+RUN chmod +x scan
+
+ENTRYPOINT ["./scan"]
+CMD ["/code"]