Dockerfile: add a dockerfile that install docurium with its dependencies

Author: carlosmn

Dockerfile

@@ -0,0 +1,8 @@
+FROM debian:jessie-slim
+
+# We need these packages to build ruby extensions, rugged and to parse the C
+# code. pygments is there to highlight the code examples.
+RUN apt update
+RUN apt install -y cmake pkg-config ruby ruby-dev llvm libclang-3.5-dev libssl-dev python-pygments
+
+RUN gem install docurium