README and service-file-template added

README.adoc

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+= DNSBL exporter
+
+Provides an exporter to scan known DNSBL-provides for listing of target-IP.
+
+== Installation
+
+You have to installed ruby and bundler.
+
+1. Clone the repository to the destination, you want to have installed dnsbl_exporter.
+2. 
++
+	useradd prometheus
+	sudo -u prometheus bundle install
+	erb dnsbl_exporter.service.erb > /etc/systemd/system/dnsbl_exporter.service
+	systemctl daemon-reload
+	systemctl enable --now dnsbl_exporter.service

dnsbl_exporter.service.erb

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+[Unit]
+Description=Prometheus dnsbl_exporter 
+
+[Service]
+Restart=always
+User=prometheus
+WorkingDirectory=<%= Dir.pwd %>
+ExecStart=<%= `which bundle`.chomp %> exec puma -b tcp://localhost:9123
+
+[Install]
+WantedBy=multi-user.target