Add initial CLI class

lib/periodicity/cli.rb

@@ -1,5 +1,23 @@
+require 'periodicity'
+
 module Periodicity
-  class Cli
-    
+  class CLI
+    include Singleton
+
+    def run
+      load_rails
+      print_banner
+    end
+
+    def print_banner
+      puts "Loading Periodicity #{Periodicity::VERSION}"
+      puts "Running in #{RUBY_DESCRIPTION}"
+    end
+
+    def load_rails
+      require 'rails'
+      require File.expand_path("config/environment.rb")
+      ::Rails.application.eager_load!
+    end
   end
 end