Added dockerfile

Issue #5
Close #5

Dockerfile

@@ -0,0 +1,30 @@
+FROM python:3.8
+
+ENV TZ Asia/Shanghai
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+ADD . /dnslog
+RUN pip install -r /dnslog/requirements.txt
+RUN chmod +x /dnslog/docker-entrypoint.sh
+
+WORKDIR /dnslog
+EXPOSE 53
+
+ENTRYPOINT ["/dnslog/docker-entrypoint.sh"]
+
+# Install nginx
+RUN apt update -y
+RUN apt-get install -y \
+		ca-certificates \
+		nginx \
+		gettext-base \
+	&& rm -rf /var/lib/apt/lists/*
+
+RUN ln -sf /dev/stdout /var/log/nginx/access.log \
+	&& ln -sf /dev/stderr /var/log/nginx/error.log
+
+RUN cp /dnslog/dnslog_nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]