Create Dockerfile and README.md

Dockerfile

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+FROM ruby:2.4
+
+MAINTAINER Jacob Henner <code@ventricle.us>
+
+RUN gem install puppet puppet-lint puppet-syntax rspec-puppet puppetlabs_spec_helper jsonlint yaml-lint

README.md

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+# puppet-test-docker
+
+## Purpose
+This Docker image is useful for testing Puppet code, especially as the base image for a dockerized continuous integration process. It includes the following RubyGems:
+
+1. puppet 
+2. puppet-lint 
+3. puppet-syntax 
+4. rspec-puppet 
+5. puppetlabs_spec_helper 
+6. jsonlint 
+7. yaml-lint
+
+## Using this image
+To pull this image: `docker pull jacobhenner/puppet-test`
+
+To run this image interactively: `docker run -it jacobhenner/puppet-test /bin/bash`
+
+## Copyright
+See [LICENSE](LICENSE).