Initial project structure with dry/cli

Rakefile

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+require 'bundler/setup'
+
+task :run do
+  system("ruby src/pchwbm.rb")
+end
+
+namespace :test do
+  task :all do
+    Rake::Task['test:rubocop'].invoke()
+  end
+
+  task :rubocop do
+    system("rubocop src/")
+  end
+end