(GH-12) Add example spec puppet configuration

This commit mocks up a configuration file for pupetlabs_spec_helper. 
The accompanying Dockerfile demonstrates how this would be translated into a docker image.

examples/tools/spec_puppet/Dockerfile

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+# based upon the work in https://github.com/da-ar/pcv-test/
+# this file is a mock up of what a generated file based on the prm-config.yml
+# would have to contain in order to work.
+
+# build with:
+# docker build -t pdk:puppet-7.11.0-puppet_spec -f examples/tools/spec_puppet/Dockerfile .
+
+# run with:
+# needs_write_access: true
+# docker run -v ${PWD}:/module -w /module pdk:puppet-7.11.0-puppet_spec
+
+# gem - gems need ruby - so get puppet...
+FROM puppet/puppet-agent:7.11.0
+# requires_git: true
+RUN apt update
+RUN apt install git -y
+# name: [puppetlabs_spec_helper, rspec-puppet-facts]
+RUN /opt/puppetlabs/puppet/bin/gem install puppetlabs_spec_helper --no-document
+RUN /opt/puppetlabs/puppet/bin/gem install rspec-puppet-facts --no-document
+COPY examples/tools/spec_puppet/content/Rakefile /tmp/Rakefile
+VOLUME [ "/module" ]
+
+# executable: rake
+ENTRYPOINT [ "/opt/puppetlabs/puppet/bin/rake" ,"-f", "/tmp/Rakefile"]
+# default_args: [spec]
+CMD [ "spec" ]

examples/tools/spec_puppet/content/Rakefile

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+require 'puppetlabs_spec_helper/rake_tasks'

examples/tools/spec_puppet/prm-config.yml

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+---
+plugin:
+  author: puppetlabs
+  id: spec_puppet
+  display: Spec Puppet
+  version: 0.1.0
+  upstream_project_url: https://github.com/puppetlabs/puppetlabs_spec_helper
+
+gem:
+  build_tools: false
+  name: [puppetlabs_spec_helper, rspec-puppet-facts]
+  executable: rake
+
+common:
+  requires_git: true # suggested new
+  can_validate: true
+  needs_write_access: true
+  default_args: [spec]
+  help_arg: '--help'
+  success_exit_code: 0
+  interleave_stdout_err: false