Create Readme.md

Readme.md

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+# Docker ckan image  ![Docker Pulls](https://img.shields.io/docker/pulls/keitaro/ckan.svg)
+
+## Overview
+
+This repository contains base docker image used to build CKAN instances. It's based on [Alpine Linux](https://alpinelinux.org/) and includes only required extensions to start CKAN instance.
+
+## Build
+
+To create new image run:
+
+```sh 
+docker build --tag ckan-2.8.2 . 
+``` 
+The –-tag ckan-2.8.2 flag sets the image name to ckan-2.8.2 and the dot ( “.” ) at the end tells docker build to look into the current directory for Dockerfile and related contents.
+
+## List
+
+Check if the image shows up in the list of images:
+```sh
+ docker images
+```
+
+## Run
+
+To start and test newly created image run:
+```sh
+ docker run ckan-2.8.2
+```
+Check if CKAN was succesfuly started on http://localhost:5000. The ckan site url is configured in ENV CKAN_SITE_URL.
+
+
+## Upload to DockerHub
+
+>*It's recommended to upload built images to DockerHub* 
+
+To upload the image to DockerHub run:
+
+```sh 
+docker push [options] <docker-hub>/ckan:<image-tag> 
+```
+
+## Upgrade 
+To upgrade the Docker file to use new CKAN version, in the Dockerfile you should change:
+
+>ENV GIT_BRANCH={ckan_release} 
+
+Check [CKAN repository](https://github.com/ckan/ckan/releases) for the latest releases. 
+If there are new libraries used by the new version requirements, those needs to be included too.
+
+## Extensions
+
+Default extensions used in the Dockerfile  are kept in:
+
+>ENV CKAN__PLUGINS envvars image_view text_view recline_view datastore datapusher
+
+## Add new scripts
+
+You can add scripts to CKAN custom images and copy them to the *docker-entrypoint.d* directory. Any *.sh or *.py file in that directory will be executed after the main initialization script (prerun.py) is executed.