Update Readme, adding Dockerfile code

Readme.md

@@ -16,6 +16,16 @@ The key benefit of Docker is that it allows users to package an application with
 In this case we are going to create a new Docker image to work with. The image is based on **Ubuntu Bionic:18.04** and it is created using `docker build`, by using the next `Dockerfile`:
 
 ``` shell
+# Ubuntu
+FROM ubuntu:bionic
+ENV UNAME="data-science-workflow"
+MAINTAINER gmarxcc
+LABEL version="0.1"
+ARG DEBIAN_FRONTEND=noninteractive
+ENV LANG=C.UTF-8 LC_ALL=C.UTF-8
+
+RUN apt-get update \
+&& apt-get install -y python3 curl 
 
 ```
  and calling the `docker build` command: