add docker file

docker/Dockerfile

+# Download base image ubuntu 20.04
+FROM ubuntu:20.04
+
+# LABEL about the custom image
+LABEL maintainer="fabian.gabel@tuhh.de"
+LABEL version="0.1"
+LABEL description="This is custom Docker Image for \
+Website deployment with bash preprocessor and pandoc."
+
+# Disable Prompt During Packages Installation
+ARG DEBIAN_FRONTEND=noninteractive
+
+# Update Ubuntu Software repository
+RUN apt update
+
+# Install nginx, php-fpm and supervisord from ubuntu repository
+RUN apt -y install pandoc 
+
+CMD /bin/bash
\ No newline at end of file