added Puppet documentation, Jenkinsfile and Gemfile for CI

Gemfile

@@ -0,0 +1,22 @@
+source ENV['GEM_SOURCE'] || 'https://rubygems.org'
+
+puppetversion = ENV.key?('PUPPET_VERSION') ? ENV['PUPPET_VERSION'] : ['>= 3.3']
+gem 'metadata-json-lint'
+gem 'puppet', puppetversion
+gem 'puppetlabs_spec_helper', '>= 1.0.0'
+gem 'puppet-lint', '>= 1.0.0'
+gem 'facter', '>= 1.7.0'
+gem 'rspec-puppet'
+gem 'puppet-strings'
+gem 'rake'
+gem 'semantic_puppet'
+gem 'rgen'
+
+# rspec must be v2 for ruby 1.8.7
+if RUBY_VERSION >= '1.8.7' && RUBY_VERSION < '1.9'
+  gem 'rspec', '~> 2.0'
+  gem 'rake', '~> 10.0'
+else
+  # rubocop requires ruby >= 1.9
+  gem 'rubocop'
+end