Create README.md

Author: eteeselink

README.md

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+# docker-elixir-yarn
+Docker image for CI builds that combines Elixir and Node+Yarn. Hosted on Docker Hub here: [skrebbel/docker-elixir-yarn](https://hub.docker.com/repository/docker/skrebbel/docker-elixir-yarn)
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+We use this at TalkJS for our CI builds. No promises that it's good for anything else!
+
+To make changes from inside GitHub UI, do:
+- Edit the Dockerfile by opening it and clicking "Edit", then commit
+- Assuming you version bumped something, create a new tag by going to "releases" and clicking "Create new release". That's just `git tag` for the lazy.
+- Docker Hub is now going to autobuild stuff.
+- Update the reference to [skrebbel/docker-elixir-yarn](https://hub.docker.com/repository/docker/skrebbel/docker-elixir-yarn) inside wherever you're using it (eg circle.yml)