added a command and 2 templates

added the gnuplot command
added a peepdf dockerfile
added a berbone dockerfile as a template

dockerfiles/template.dockerfile

@@ -0,0 +1,10 @@
+FROM debian:stretch
+#FROM ubuntu:16.04
+
+MAINTAINER tabledevil
+
+
+RUN groupadd -g 999 user && \
+    useradd -r -u 999 -g user user
+
+USER user